lager_logger:error undef exception

[Feng Lee]

** When handler state == {<0.42.0>,"log/emqttd_sasl.log",all}
** Reason == {'module could not be loaded',
[{lib,format_exception,
[5,exit,
{undef,
[{lager_logger,error,
["acceptor on ~s suspend 100(ms) for ~p emfile errors!!!",
[["0.0.0.0",58,"1883"],0]],
[]},
{esockd_acceptor,sockerr,2,
[{file,"src/esockd_acceptor.erl"},{line,169}]},
{gen_server,try_dispatch,4,
[{file,"gen_server.erl"},{line,615}]},
{gen_server,handle_msg,5,
[{file,"gen_server.erl"},{line,681}]},
{proc_lib,init_p_do_apply,3,
[{file,"proc_lib.erl"},{line,240}]}]},
[{gen_server,terminate,7,
[{file,"gen_server.erl"},{line,826}]},
{proc_lib,init_p_do_apply,3,
[{file,"proc_lib.erl"},{line,240}]}],
#Fun<proc_lib.0.32310957>,#Fun<proc_lib.1.32310957>,
latin1],
[]},
{proc_lib,format_exception,4,
[{file,"proc_lib.erl"},{line,739}]},
{proc_lib,format_rep,2,[{file,"proc_lib.erl"},{line,728}]},
{proc_lib,format_rep,2,[{file,"proc_lib.erl"},{line,730}]},
{proc_lib,format_rep,2,[{file,"proc_lib.erl"},{line,726}]},
{proc_lib,format,3,[{file,"proc_lib.erl"},{line,714}]},
{sasl_report,write_report2,5,
[{file,"sasl_report.erl"},{line,72}]},
{sasl_report_file_h,handle_event,2,
[{file,"sasl_report_file_h.erl"},{line,44}]}]}