Hi, I am trying to GEventEvaluator/JaninoEventEvaluator filter but expression is not working...it keeps print messages even condition is false. i am using groovy configuration. and logback 1.0.13 and janino 2.7.8. i am getting the following error in trace. 17:04:07,255 |-ERROR in ch.qos.logback.classic.gaffer.AppenderDelegate@12a94400 - Appender [SELM] of type [ch.qos.logback.core.ConsoleAppender] has no appplicable [EvaluatorFilter] property 17:04:07,265 |-ERROR in ch.qos.logback.classic.gaffer.AppenderDelegate@12a94400 - Unexpected argument type org.codehaus.groovy.runtime.NullObject 17:04:07,265 |-ERROR in ch.qos.logback.classic.gaffer.AppenderDelegate@12a94400 - No 'class' argument specified for [filter] in appender [SELM] of type [ch.qos.logback.core.ConsoleAppender] -------------------------------------------------------------- config file appender("SELM", ConsoleAppender) { filter(EvaluatorFilter) { evaluator(GEventEvaluator) { expression = '(e.mdc?.get("job_name").contains("selm") )' } onMismatch = DENY onMatch = NEUTRAL } encoder(PatternLayoutEncoder) { pattern = "%date %-5level [${pid}-${HOSTNAME} %thread] %logger{30} - %msg %ex{full}%n" } }