```erlang 1.error_logger:error_msg( "an error has occurred\n" ). 2.error_logger:error_msg( "~s, an error has occurred\n", [ "joe" ] ). 3.error_logger:error_report( [{tag1,data1}, a_term, {tar2, data}] ). 4.error_logger:info_msg(FormatStr, Args); 5.error_logger:warning_msg(FormatStr, Args); 6.error_logger:info_report(progress,[{application,test},{started_at, nonode@noh ost}]).   error_logger:info_report(crash,[{application,test},{started_at, nonode@noh ost}]). ```