riak error

gistfile1.txt

2016-03-29 07:36:23.637 [error] <0.18828.467> CRASH REPORT Process <0.18828.467> with 0 neighbours exited with reason: no match of right hand value {error,{db_open,"IO error: lock /var/lib/riak/anti_entropy/867766597165223607683437869425293042920709947392/LOCK: already held by process"}} in hashtree:new_segment_store/2 line 675 in gen_server:init_it/6 line 328


2016-03-29 07:36:23 =CRASH REPORT====
  crasher:
    initial call: riak_kv_index_hashtree:init/1
    pid: <0.18828.467>
    registered_name: []
    exception exit: {{{badmatch,{error,{db_open,"IO error: lock /var/lib/riak/anti_entropy/1050454301831586472458898473514828420377701515264/LOCK: already held by process"}}},[{hashtree,new_segment_store,2,[{file,"src/hashtree.erl"},{line,675}]},{hashtree,new,2,[{file,"src/hashtree.erl"},{line,246}]},{riak_kv_index_hashtree,do_new_tree,3,[{file,"src/riak_kv_index_hashtree.erl"},{line,610}]},{lists,foldl,3,[{file,"lists.erl"},{line,1248}]},{riak_kv_index_hashtree,init_trees,3,[{file,"src/riak_kv_index_hashtree.erl"},{line,474}]},{riak_kv_index_hashtree,init,1,[{file,"src/riak_kv_index_hashtree.erl"},{line,268}]},{gen_server,init_it,6,[{file,"gen_server.erl"},{line,304}]},{proc_lib,init_p_do_apply,3,[{file,"proc_lib.erl"},{line,239}]}]},[{gen_server,init_it,6,[{file,"gen_server.erl"},{line,328}]},{proc_lib,init_p_do_apply,3,[{file,"proc_lib.erl"},{line,239}]}]}
    ancestors: [<0.23940.111>,riak_core_vnode_sup,riak_core_sup,<0.223.0>]
    messages: []
    links: []
    dictionary: []
    trap_exit: false
    status: running
    heap_size: 2586
    stack_size: 27
    reductions: 890
  neighbours: