Call bitcask_merge_worker:merge(DirName) is error

[changking]

=ERROR REPORT==== 27-Sep-2019::10:50:34 ===
Error in process <0.46.0> with exit value: {{badmatch,["bitcask",[]]},[{bitcask_merge_worker,do_merge,1,[{file,"src/bitcask_merge_worker.erl"},{line,197}]}]}

=ERROR REPORT==== 27-Sep-2019::10:50:34 ===
Merge worker PID exited: {{badmatch,["bitcask",[]]},
[{bitcask_merge_worker,do_merge,1,
[{file,"src/bitcask_merge_worker.erl"},
{line,197}]}]}

=ERROR REPORT==== 27-Sep-2019::10:50:34 ===
** Generic server bitcask_merge_worker terminating
** Last message in was {'EXIT',<0.46.0>,
{{badmatch,["bitcask",[]]},
[{bitcask_merge_worker,do_merge,1,
[{file,"src/bitcask_merge_worker.erl"},
{line,197}]}]}}
** When Server state == {state,[],<0.46.0>}
** Reason for termination ==
** {bad_return_value,{stop,{state,[],<0.46.0>}}}