java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy.isTriggeringEvent(SizeBasedTriggeringPolicy.java:59)
at ch.qos.logback.core.rolling.RollingFileAppender.subAppend(RollingFileAppender.java:143)
at ch.qos.logback.core.OutputStreamAppender.append(OutputStreamAppender.java:103)
at ch.qos.logback.core.UnsynchronizedAppenderBase.doAppend(UnsynchronizedAppenderBase.java:88)
at ch.qos.logback.classic.Logger.appendLoopOnAppenders(Logger.java:280)
at ch.qos.logback.classic.Logger.callAppenders(Logger.java:267)
at ch.qos.logback.classic.Logger.buildLoggingEventAndAppend(Logger.java:449)
at ch.qos.logback.classic.Logger.filterAndLog_2(Logger.java:440)

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