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java.lang.NullPointerException: 	at org.sonatype.timeline.internal.DefaultTimeline.purgeOlderThan(DefaultTimeline.java:165)	at org.sonatype.nexus.timeline.DefaultNexusTimeline.purgeOlderThan(DefaultNexusTimeline.java:157)	at org.sonatype.nexus.timeline.tasks.PurgeTimeline.doRun(PurgeTimeline.java:50)	at org.sonatype.nexus.scheduling.AbstractNexusTask.call(AbstractNexusTask.java:151)	at org.sonatype.scheduling.DefaultScheduledTask.call(DefaultScheduledTask.java:418)	at org.sonatype.nexus.threads.MDCAwareCallable.call(MDCAwareCallable.java:44)	at org.apache.shiro.subject.support.SubjectCallable.doCall(SubjectCallable.java:90)	at org.apache.shiro.subject.support.SubjectCallable.call(SubjectCallable.java:83)	at java.util.concurrent.FutureTask.run(FutureTask.java:262)	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:178)	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:292)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)	at java.lang.Thread.run(Thread.java:744)