error

> leveldown@1.4.0 install D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown
> prebuild --download

Building the projects in this solution one at a time. To enable parallel build, please add the "/m" switch.
  builder.cc
  db_impl.cc
  db_iter.cc
  filename.cc
  dbformat.cc
  leveldb_main.cc
  log_reader.cc
  log_writer.cc
  memtable.cc
  repair.cc
  table_cache.cc
  version_edit.cc
  version_set.cc
  write_batch.cc
  memenv.cc
  block.cc
  block_builder.cc
  filter_block.cc
leveldb-1.18.0\table\filter_block.cc(100): warning C4018: '<=' : signed/unsigned mismatch [D:\node\ test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\deps\leveldb \leveldb.vcxproj]
  format.cc
  iterator.cc
  merger.cc
  table.cc
  table_builder.cc
  two_level_iterator.cc
  arena.cc
  bloom.cc
  cache.cc
leveldb-1.18.0\util\bloom.cc(50): warning C4018: '<' : signed/unsigned mismatch [D:\node\test\node_ modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\deps\leveldb\leveldb.v cxproj]
  coding.cc
  comparator.cc
  crc32c.cc
  env.cc
  filter_policy.cc
  hash.cc
  logging.cc
  options.cc
  status.cc
  port_uv.cc
  env_win.cc
  win_logger.cc
  leveldb.vcxproj -> D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_m
  odules\leveldown\build\Release\\leveldb.lib
  snappy-sinksource.cc
  snappy-stubs-internal.cc
  snappy.cc
  snappy.vcxproj -> D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_mo
  dules\leveldown\build\Release\\snappy.lib
  batch.cc
  batch_async.cc
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(263): error C2995: 'v8::Local<T> _NanEnsureLocal(v8::Local<T>)' : function templ ate has already been defined (..\src\batch.cc) [D:\node\test\node_modules\duo\node_modules\duo-cach e\node_modules\level\node_modules\leveldown\build\leveldown.vcxproj]
          D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leve
  ldown\node_modules\nan\nan.h(256) : see declaration of '_NanEnsureLocal'
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(661): error C3083: 'smalloc': the symbol to the left of a '::' must be a type (. .\src\batch.cc) [D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modul es\leveldown\build\leveldown.vcxproj]
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(661): error C2039: 'FreeCallback' : is not a member of 'node' (..\src\batch.cc)
[D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\bui ld\leveldown.vcxproj]
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(263): error C2995: 'v8::Local<T> _NanEnsureLocal(v8::Local<T>)' : function templ ate has already been defined (..\src\batch_async.cc) [D:\node\test\node_modules\duo\node_modules\du o-cache\node_modules\level\node_modules\leveldown\build\leveldown.vcxproj]
          D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leve
  ldown\node_modules\nan\nan.h(256) : see declaration of '_NanEnsureLocal'
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(661): error C2061: syntax error : identifier 'FreeCallback' (..\src\batch.cc) [D :\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\build \leveldown.vcxproj]
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(665): error C2065: 'callback' : undeclared identifier (..\src\batch.cc) [D:\node \test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\build\level down.vcxproj]
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(665): error C2065: 'hint' : undeclared identifier (..\src\batch.cc) [D:\node\tes t\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\build\leveldown .vcxproj]
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(672): error C2665: 'node::Buffer::New' : none of the 4 overloads could convert a ll the argument types (..\src\batch.cc) [D:\node\test\node_modules\duo\node_modules\duo-cache\node_ modules\level\node_modules\leveldown\build\leveldown.vcxproj]
          C:\Users\Darsain\.node-gyp\3.0.0\src\node_buffer.h(47): could be 'v8::MaybeLocal<v8::Obje
  ct> node::Buffer::New(v8::Isolate *,char *,size_t)'
          C:\Users\Darsain\.node-gyp\3.0.0\src\node_buffer.h(35): or       'v8::MaybeLocal<v8::Obje
  ct> node::Buffer::New(v8::Isolate *,v8::Local<v8::String>,node::encoding)'
          while trying to match the argument list '(v8::Isolate *, const char *, uint32_t)'
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(676): error C2664: 'v8::Local<v8::Object>::Local(const v8::Local<v8::Object> &)'  : cannot convert argument 1 from 'v8::MaybeLocal<v8::Object>' to 'const v8::Local<v8::Object> &' ( ..\src\batch.cc) [D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modu les\leveldown\build\leveldown.vcxproj]
          Reason: cannot convert from 'v8::MaybeLocal<v8::Object>' to 'const v8::Local<v8::Object>'
          No user-defined-conversion operator available that can perform this conversion, or the op
  erator cannot be called
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(661): error C3083: 'smalloc': the symbol to the left of a '::' must be a type (. .\src\batch_async.cc) [D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node _modules\leveldown\build\leveldown.vcxproj]
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(683): error C2039: 'Use' : is not a member of 'node::Buffer' (..\src\batch.cc) [ D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\buil d\leveldown.vcxproj]
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(661): error C2039: 'FreeCallback' : is not a member of 'node' (..\src\batch_asyn c.cc) [D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldo wn\build\leveldown.vcxproj]
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(683): error C3861: 'Use': identifier not found (..\src\batch.cc) [D:\node\test\n ode_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\build\leveldown.vc xproj]
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(661): error C2061: syntax error : identifier 'FreeCallback' (..\src\batch_async. cc) [D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown \build\leveldown.vcxproj]
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(665): error C2065: 'callback' : undeclared identifier (..\src\batch_async.cc) [D :\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\build \leveldown.vcxproj]
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(665): error C2065: 'hint' : undeclared identifier (..\src\batch_async.cc) [D:\no de\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\build\lev eldown.vcxproj]
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(672): error C2665: 'node::Buffer::New' : none of the 4 overloads could convert a ll the argument types (..\src\batch_async.cc) [D:\node\test\node_modules\duo\node_modules\duo-cache \node_modules\level\node_modules\leveldown\build\leveldown.vcxproj]
          C:\Users\Darsain\.node-gyp\3.0.0\src\node_buffer.h(47): could be 'v8::MaybeLocal<v8::Obje
  ct> node::Buffer::New(v8::Isolate *,char *,size_t)'
          C:\Users\Darsain\.node-gyp\3.0.0\src\node_buffer.h(35): or       'v8::MaybeLocal<v8::Obje
  ct> node::Buffer::New(v8::Isolate *,v8::Local<v8::String>,node::encoding)'
          while trying to match the argument list '(v8::Isolate *, const char *, uint32_t)'
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(676): error C2664: 'v8::Local<v8::Object>::Local(const v8::Local<v8::Object> &)'  : cannot convert argument 1 from 'v8::MaybeLocal<v8::Object>' to 'const v8::Local<v8::Object> &' ( ..\src\batch_async.cc) [D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\nod e_modules\leveldown\build\leveldown.vcxproj]
          Reason: cannot convert from 'v8::MaybeLocal<v8::Object>' to 'const v8::Local<v8::Object>'
          No user-defined-conversion operator available that can perform this conversion, or the op
  erator cannot be called
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(683): error C2039: 'Use' : is not a member of 'node::Buffer' (..\src\batch_async .cc) [D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldow n\build\leveldown.vcxproj]
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(683): error C3861: 'Use': identifier not found (..\src\batch_async.cc) [D:\node\ test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\build\leveld own.vcxproj]
  database.cc
  database_async.cc
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(263): error C2995: 'v8::Local<T> _NanEnsureLocal(v8::Local<T>)' : function templ ate has already been defined (..\src\database.cc) [D:\node\test\node_modules\duo\node_modules\duo-c ache\node_modules\level\node_modules\leveldown\build\leveldown.vcxproj]
          D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leve
  ldown\node_modules\nan\nan.h(256) : see declaration of '_NanEnsureLocal'
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(661): error C3083: 'smalloc': the symbol to the left of a '::' must be a type (. .\src\database.cc) [D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_mo dules\leveldown\build\leveldown.vcxproj]
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(661): error C2039: 'FreeCallback' : is not a member of 'node' (..\src\database.c c) [D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\ build\leveldown.vcxproj]
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(661): error C2061: syntax error : identifier 'FreeCallback' (..\src\database.cc)  [D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\bu ild\leveldown.vcxproj]
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(665): error C2065: 'callback' : undeclared identifier (..\src\database.cc) [D:\n ode\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\build\le veldown.vcxproj]
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(665): error C2065: 'hint' : undeclared identifier (..\src\database.cc) [D:\node\ test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\build\leveld own.vcxproj]
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(672): error C2665: 'node::Buffer::New' : none of the 4 overloads could convert a ll the argument types (..\src\database.cc) [D:\node\test\node_modules\duo\node_modules\duo-cache\no de_modules\level\node_modules\leveldown\build\leveldown.vcxproj]
          C:\Users\Darsain\.node-gyp\3.0.0\src\node_buffer.h(47): could be 'v8::MaybeLocal<v8::Obje
  ct> node::Buffer::New(v8::Isolate *,char *,size_t)'
          C:\Users\Darsain\.node-gyp\3.0.0\src\node_buffer.h(35): or       'v8::MaybeLocal<v8::Obje
  ct> node::Buffer::New(v8::Isolate *,v8::Local<v8::String>,node::encoding)'
          while trying to match the argument list '(v8::Isolate *, const char *, uint32_t)'
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(676): error C2664: 'v8::Local<v8::Object>::Local(const v8::Local<v8::Object> &)'  : cannot convert argument 1 from 'v8::MaybeLocal<v8::Object>' to 'const v8::Local<v8::Object> &' ( ..\src\database.cc) [D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_m odules\leveldown\build\leveldown.vcxproj]
          Reason: cannot convert from 'v8::MaybeLocal<v8::Object>' to 'const v8::Local<v8::Object>'
          No user-defined-conversion operator available that can perform this conversion, or the op
  erator cannot be called
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(683): error C2039: 'Use' : is not a member of 'node::Buffer' (..\src\database.cc ) [D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\b uild\leveldown.vcxproj]
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(683): error C3861: 'Use': identifier not found (..\src\database.cc) [D:\node\tes t\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\build\leveldown .vcxproj]
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(263): error C2995: 'v8::Local<T> _NanEnsureLocal(v8::Local<T>)' : function templ ate has already been defined (..\src\database_async.cc) [D:\node\test\node_modules\duo\node_modules \duo-cache\node_modules\level\node_modules\leveldown\build\leveldown.vcxproj]
          D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leve
  ldown\node_modules\nan\nan.h(256) : see declaration of '_NanEnsureLocal'
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(661): error C3083: 'smalloc': the symbol to the left of a '::' must be a type (. .\src\database_async.cc) [D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\n ode_modules\leveldown\build\leveldown.vcxproj]
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(661): error C2039: 'FreeCallback' : is not a member of 'node' (..\src\database_a sync.cc) [D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leve ldown\build\leveldown.vcxproj]
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(661): error C2061: syntax error : identifier 'FreeCallback' (..\src\database_asy nc.cc) [D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveld own\build\leveldown.vcxproj]
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(665): error C2065: 'callback' : undeclared identifier (..\src\database_async.cc)  [D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\bu ild\leveldown.vcxproj]
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(665): error C2065: 'hint' : undeclared identifier (..\src\database_async.cc) [D: \node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\build\ leveldown.vcxproj]
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(672): error C2665: 'node::Buffer::New' : none of the 4 overloads could convert a ll the argument types (..\src\database_async.cc) [D:\node\test\node_modules\duo\node_modules\duo-ca che\node_modules\level\node_modules\leveldown\build\leveldown.vcxproj]
          C:\Users\Darsain\.node-gyp\3.0.0\src\node_buffer.h(47): could be 'v8::MaybeLocal<v8::Obje
  ct> node::Buffer::New(v8::Isolate *,char *,size_t)'
          C:\Users\Darsain\.node-gyp\3.0.0\src\node_buffer.h(35): or       'v8::MaybeLocal<v8::Obje
  ct> node::Buffer::New(v8::Isolate *,v8::Local<v8::String>,node::encoding)'
          while trying to match the argument list '(v8::Isolate *, const char *, uint32_t)'
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(676): error C2664: 'v8::Local<v8::Object>::Local(const v8::Local<v8::Object> &)'  : cannot convert argument 1 from 'v8::MaybeLocal<v8::Object>' to 'const v8::Local<v8::Object> &' ( ..\src\database_async.cc) [D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\ node_modules\leveldown\build\leveldown.vcxproj]
          Reason: cannot convert from 'v8::MaybeLocal<v8::Object>' to 'const v8::Local<v8::Object>'
          No user-defined-conversion operator available that can perform this conversion, or the op
  erator cannot be called
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(683): error C2039: 'Use' : is not a member of 'node::Buffer' (..\src\database_as ync.cc) [D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\level down\build\leveldown.vcxproj]
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(683): error C3861: 'Use': identifier not found (..\src\database_async.cc) [D:\no de\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\build\lev eldown.vcxproj]
  iterator.cc
  iterator_async.cc
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(263): error C2995: 'v8::Local<T> _NanEnsureLocal(v8::Local<T>)' : function templ ate has already been defined (..\src\iterator.cc) [D:\node\test\node_modules\duo\node_modules\duo-c ache\node_modules\level\node_modules\leveldown\build\leveldown.vcxproj]
          D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leve
  ldown\node_modules\nan\nan.h(256) : see declaration of '_NanEnsureLocal'
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(263): error C2995: 'v8::Local<T> _NanEnsureLocal(v8::Local<T>)' : function templ ate has already been defined (..\src\iterator_async.cc) [D:\node\test\node_modules\duo\node_modules \duo-cache\node_modules\level\node_modules\leveldown\build\leveldown.vcxproj]
          D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leve
  ldown\node_modules\nan\nan.h(256) : see declaration of '_NanEnsureLocal'
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(661): error C3083: 'smalloc': the symbol to the left of a '::' must be a type (. .\src\iterator_async.cc) [D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\n ode_modules\leveldown\build\leveldown.vcxproj]
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(661): error C3083: 'smalloc': the symbol to the left of a '::' must be a type (. .\src\iterator.cc) [D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_mo dules\leveldown\build\leveldown.vcxproj]
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(661): error C2039: 'FreeCallback' : is not a member of 'node' (..\src\iterator_a sync.cc) [D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leve ldown\build\leveldown.vcxproj]
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(661): error C2039: 'FreeCallback' : is not a member of 'node' (..\src\iterator.c c) [D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\ build\leveldown.vcxproj]
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(661): error C2061: syntax error : identifier 'FreeCallback' (..\src\iterator_asy nc.cc) [D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveld own\build\leveldown.vcxproj]
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(661): error C2061: syntax error : identifier 'FreeCallback' (..\src\iterator.cc)  [D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\bu ild\leveldown.vcxproj]
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(665): error C2065: 'callback' : undeclared identifier (..\src\iterator_async.cc)  [D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\bu ild\leveldown.vcxproj]
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(665): error C2065: 'hint' : undeclared identifier (..\src\iterator_async.cc) [D: \node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\build\ leveldown.vcxproj]
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(665): error C2065: 'callback' : undeclared identifier (..\src\iterator.cc) [D:\n ode\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\build\le veldown.vcxproj]
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(672): error C2665: 'node::Buffer::New' : none of the 4 overloads could convert a ll the argument types (..\src\iterator_async.cc) [D:\node\test\node_modules\duo\node_modules\duo-ca che\node_modules\level\node_modules\leveldown\build\leveldown.vcxproj]
          C:\Users\Darsain\.node-gyp\3.0.0\src\node_buffer.h(47): could be 'v8::MaybeLocal<v8::Obje
  ct> node::Buffer::New(v8::Isolate *,char *,size_t)'
          C:\Users\Darsain\.node-gyp\3.0.0\src\node_buffer.h(35): or       'v8::MaybeLocal<v8::Obje
  ct> node::Buffer::New(v8::Isolate *,v8::Local<v8::String>,node::encoding)'
          while trying to match the argument list '(v8::Isolate *, const char *, uint32_t)'
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(665): error C2065: 'hint' : undeclared identifier (..\src\iterator.cc) [D:\node\ test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\build\leveld own.vcxproj]
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(676): error C2664: 'v8::Local<v8::Object>::Local(const v8::Local<v8::Object> &)'  : cannot convert argument 1 from 'v8::MaybeLocal<v8::Object>' to 'const v8::Local<v8::Object> &' ( ..\src\iterator_async.cc) [D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\ node_modules\leveldown\build\leveldown.vcxproj]
          Reason: cannot convert from 'v8::MaybeLocal<v8::Object>' to 'const v8::Local<v8::Object>'
          No user-defined-conversion operator available that can perform this conversion, or the op
  erator cannot be called
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(672): error C2665: 'node::Buffer::New' : none of the 4 overloads could convert a ll the argument types (..\src\iterator.cc) [D:\node\test\node_modules\duo\node_modules\duo-cache\no de_modules\level\node_modules\leveldown\build\leveldown.vcxproj]
          C:\Users\Darsain\.node-gyp\3.0.0\src\node_buffer.h(47): could be 'v8::MaybeLocal<v8::Obje
  ct> node::Buffer::New(v8::Isolate *,char *,size_t)'
          C:\Users\Darsain\.node-gyp\3.0.0\src\node_buffer.h(35): or       'v8::MaybeLocal<v8::Obje
  ct> node::Buffer::New(v8::Isolate *,v8::Local<v8::String>,node::encoding)'
          while trying to match the argument list '(v8::Isolate *, const char *, uint32_t)'
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(683): error C2039: 'Use' : is not a member of 'node::Buffer' (..\src\iterator_as ync.cc) [D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\level down\build\leveldown.vcxproj]
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(676): error C2664: 'v8::Local<v8::Object>::Local(const v8::Local<v8::Object> &)'  : cannot convert argument 1 from 'v8::MaybeLocal<v8::Object>' to 'const v8::Local<v8::Object> &' ( ..\src\iterator.cc) [D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_m odules\leveldown\build\leveldown.vcxproj]
          Reason: cannot convert from 'v8::MaybeLocal<v8::Object>' to 'const v8::Local<v8::Object>'
          No user-defined-conversion operator available that can perform this conversion, or the op
  erator cannot be called
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(683): error C3861: 'Use': identifier not found (..\src\iterator_async.cc) [D:\no de\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\build\lev eldown.vcxproj]
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(683): error C2039: 'Use' : is not a member of 'node::Buffer' (..\src\iterator.cc ) [D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\b uild\leveldown.vcxproj]
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(683): error C3861: 'Use': identifier not found (..\src\iterator.cc) [D:\node\tes t\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\build\leveldown .vcxproj]
  leveldown.cc
  leveldown_async.cc
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(263): error C2995: 'v8::Local<T> _NanEnsureLocal(v8::Local<T>)' : function templ ate has already been defined (..\src\leveldown.cc) [D:\node\test\node_modules\duo\node_modules\duo- cache\node_modules\level\node_modules\leveldown\build\leveldown.vcxproj]
          D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leve
  ldown\node_modules\nan\nan.h(256) : see declaration of '_NanEnsureLocal'
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(661): error C3083: 'smalloc': the symbol to the left of a '::' must be a type (. .\src\leveldown.cc) [D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_m odules\leveldown\build\leveldown.vcxproj]
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(661): error C2039: 'FreeCallback' : is not a member of 'node' (..\src\leveldown. cc) [D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown \build\leveldown.vcxproj]
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(661): error C2061: syntax error : identifier 'FreeCallback' (..\src\leveldown.cc ) [D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\b uild\leveldown.vcxproj]
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(665): error C2065: 'callback' : undeclared identifier (..\src\leveldown.cc) [D:\ node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\build\l eveldown.vcxproj]
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(665): error C2065: 'hint' : undeclared identifier (..\src\leveldown.cc) [D:\node \test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\build\level down.vcxproj]
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(672): error C2665: 'node::Buffer::New' : none of the 4 overloads could convert a ll the argument types (..\src\leveldown.cc) [D:\node\test\node_modules\duo\node_modules\duo-cache\n ode_modules\level\node_modules\leveldown\build\leveldown.vcxproj]
          C:\Users\Darsain\.node-gyp\3.0.0\src\node_buffer.h(47): could be 'v8::MaybeLocal<v8::Obje
  ct> node::Buffer::New(v8::Isolate *,char *,size_t)'
          C:\Users\Darsain\.node-gyp\3.0.0\src\node_buffer.h(35): or       'v8::MaybeLocal<v8::Obje
  ct> node::Buffer::New(v8::Isolate *,v8::Local<v8::String>,node::encoding)'
          while trying to match the argument list '(v8::Isolate *, const char *, uint32_t)'
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(676): error C2664: 'v8::Local<v8::Object>::Local(const v8::Local<v8::Object> &)'  : cannot convert argument 1 from 'v8::MaybeLocal<v8::Object>' to 'const v8::Local<v8::Object> &' ( ..\src\leveldown.cc) [D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_ modules\leveldown\build\leveldown.vcxproj]
          Reason: cannot convert from 'v8::MaybeLocal<v8::Object>' to 'const v8::Local<v8::Object>'
          No user-defined-conversion operator available that can perform this conversion, or the op
  erator cannot be called
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(683): error C2039: 'Use' : is not a member of 'node::Buffer' (..\src\leveldown.c c) [D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\ build\leveldown.vcxproj]
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(683): error C3861: 'Use': identifier not found (..\src\leveldown.cc) [D:\node\te st\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\build\leveldow n.vcxproj]
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(263): error C2995: 'v8::Local<T> _NanEnsureLocal(v8::Local<T>)' : function templ ate has already been defined (..\src\leveldown_async.cc) [D:\node\test\node_modules\duo\node_module s\duo-cache\node_modules\level\node_modules\leveldown\build\leveldown.vcxproj]
          D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leve
  ldown\node_modules\nan\nan.h(256) : see declaration of '_NanEnsureLocal'
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(661): error C3083: 'smalloc': the symbol to the left of a '::' must be a type (. .\src\leveldown_async.cc) [D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\ node_modules\leveldown\build\leveldown.vcxproj]
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(661): error C2039: 'FreeCallback' : is not a member of 'node' (..\src\leveldown_ async.cc) [D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\lev eldown\build\leveldown.vcxproj]
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(661): error C2061: syntax error : identifier 'FreeCallback' (..\src\leveldown_as ync.cc) [D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\level down\build\leveldown.vcxproj]
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(665): error C2065: 'callback' : undeclared identifier (..\src\leveldown_async.cc ) [D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\b uild\leveldown.vcxproj]
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(665): error C2065: 'hint' : undeclared identifier (..\src\leveldown_async.cc) [D :\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\build \leveldown.vcxproj]
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(672): error C2665: 'node::Buffer::New' : none of the 4 overloads could convert a ll the argument types (..\src\leveldown_async.cc) [D:\node\test\node_modules\duo\node_modules\duo-c ache\node_modules\level\node_modules\leveldown\build\leveldown.vcxproj]
          C:\Users\Darsain\.node-gyp\3.0.0\src\node_buffer.h(47): could be 'v8::MaybeLocal<v8::Obje
  ct> node::Buffer::New(v8::Isolate *,char *,size_t)'
          C:\Users\Darsain\.node-gyp\3.0.0\src\node_buffer.h(35): or       'v8::MaybeLocal<v8::Obje
  ct> node::Buffer::New(v8::Isolate *,v8::Local<v8::String>,node::encoding)'
          while trying to match the argument list '(v8::Isolate *, const char *, uint32_t)'
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(676): error C2664: 'v8::Local<v8::Object>::Local(const v8::Local<v8::Object> &)'  : cannot convert argument 1 from 'v8::MaybeLocal<v8::Object>' to 'const v8::Local<v8::Object> &' ( ..\src\leveldown_async.cc) [D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level \node_modules\leveldown\build\leveldown.vcxproj]
          Reason: cannot convert from 'v8::MaybeLocal<v8::Object>' to 'const v8::Local<v8::Object>'
          No user-defined-conversion operator available that can perform this conversion, or the op
  erator cannot be called
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(683): error C2039: 'Use' : is not a member of 'node::Buffer' (..\src\leveldown_a sync.cc) [D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leve ldown\build\leveldown.vcxproj]
D:\node\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\node _modules\nan\nan.h(683): error C3861: 'Use': identifier not found (..\src\leveldown_async.cc) [D:\n ode\test\node_modules\duo\node_modules\duo-cache\node_modules\level\node_modules\leveldown\build\le veldown.vcxproj]
prebuild ERR! build `C:\Program Files (x86)\MSBuild\12.0\bin\msbuild.exe` failed with exit code: 1
npm ERR! Windows_NT 6.3.9600
npm ERR! argv "C:\\Program Files (x86)\\iojs\\node.exe" "C:\\Program Files (x86)\\iojs\\node_modules\\npm\\bin\\npm-cli.js" "install" "duo"
npm ERR! node v3.0.0
npm ERR! npm  v2.13.3
npm ERR! code ELIFECYCLE

npm ERR! leveldown@1.4.0 install: `prebuild --download`
npm ERR! Exit status 2
npm ERR!
npm ERR! Failed at the leveldown@1.4.0 install script 'prebuild --download'.
npm ERR! This is most likely a problem with the leveldown package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR!     prebuild --download
npm ERR! You can get their info via:
npm ERR!     npm owner ls leveldown
npm ERR! There is likely additional logging output above.

npm ERR! Please include the following file with any support request:
npm ERR!     D:\node\test\npm-debug.log