Error produced by distillery

gistfile1.txt

$ MIX_ENV=prod mix release --env=prod
==> Assembling release..
==> Building release travelguardian_server:0.1.0 using environment prod
==> Including ERTS 8.1 from /usr/lib/erlang/erts-8.1
==> Packaging release..
{{case_clause,
     {'EXIT',
         {function_clause,
             [{filename,join,[[]],[{file,"filename.erl"},{line,395}]},
              {erl_tar,split_filename,4,[{file,"erl_tar.erl"},{line,471}]},
              {erl_tar,create_header,3,[{file,"erl_tar.erl"},{line,400}]},
              {erl_tar,add1,4,[{file,"erl_tar.erl"},{line,323}]},
              {erl_tar,foreach_while_ok,2,[{file,"erl_tar.erl"},{line,1000}]},
              {systools_make,add_to_tar,3,
                  [{file,"systools_make.erl"},{line,1903}]},
              {systools_make,add_appl,7,
                  [{file,"systools_make.erl"},{line,1774}]},
              {systools_make,'-add_applications/5-fun-0-',6,
                  [{file,"systools_make.erl"},{line,1593}]}]}}},
 [{systools_make,'-add_applications/5-fun-0-',6,
      [{file,"systools_make.erl"},{line,1593}]},
  {lists,foldl,3,[{file,"lists.erl"},{line,1263}]},
  {systools_make,add_applications,5,[{file,"systools_make.erl"},{line,1592}]},
  {systools_make,mk_tar,6,[{file,"systools_make.erl"},{line,1586}]},
  {systools_make,mk_tar,5,[{file,"systools_make.erl"},{line,1562}]},
  {systools_make,make_tar,2,[{file,"systools_make.erl"},{line,336}]},
  {'Elixir.Mix.Releases.Archiver',make_tar,1,
      [{file,"lib/mix/lib/releases/archiver.ex"},{line,45}]},
  {'Elixir.Mix.Releases.Archiver',archive,1,
      [{file,"lib/mix/lib/releases/archiver.ex"},{line,17}]}]}
==> Problem generating release tarball:
    {:tar_generation_error, :unknown}