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

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java.lang.NullPointerException:
at ch.qos.logback.core.rolling.helper.SizeAndTimeBasedArchiveRemover.cleanByPeriodOffset(SizeAndTimeBasedArchiveRemover.java:41)
at ch.qos.logback.core.rolling.helper.DefaultArchiveRemover.clean(DefaultArchiveRemover.java:71)
at ch.qos.logback.core.rolling.TimeBasedRollingPolicy.rollover(TimeBasedRollingPolicy.java:166)
at ch.qos.logback.core.rolling.RollingFileAppender.rollover(RollingFileAppender.java:115)
at ch.qos.logback.core.rolling.RollingFileAppender.subAppend(RollingFileAppender.java:148)
at ch.qos.logback.core.OutputStreamAppender.append(OutputStreamAppender.java:103)
at ch.qos.logback.core.UnsynchronizedAppenderBase.doAppend(UnsynchronizedAppenderBase.java:88)
at com.electriccloud.log.AsyncAppender$Dispatcher.run(AsyncAppender.java:260)
at java.lang.Thread.run(Thread.java:722)

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