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java.util.NoSuchElementException: 	at java.util.TreeMap.key(TreeMap.java:433)	at java.util.TreeMap.lastKey(TreeMap.java:297)	at java.util.TreeSet.last(TreeSet.java:417)	at org.sonatype.nexus.maven.tasks.DefaultSnapshotRemover$SnapshotRemoverWalkerProcessor.onCollectionExit(DefaultSnapshotRemover.java:410)	at org.sonatype.nexus.proxy.walker.DefaultWalker.onCollectionExit(DefaultWalker.java:373)	at org.sonatype.nexus.proxy.walker.DefaultWalker.walkRecursive(DefaultWalker.java:290)	at org.sonatype.nexus.proxy.walker.DefaultWalker.walkRecursive(DefaultWalker.java:277)	at org.sonatype.nexus.proxy.walker.DefaultWalker.walkRecursive(DefaultWalker.java:277)	at org.sonatype.nexus.proxy.walker.DefaultWalker.walkRecursive(DefaultWalker.java:277)	at org.sonatype.nexus.proxy.walker.DefaultWalker.walkRecursive(DefaultWalker.java:277)	at org.sonatype.nexus.proxy.walker.DefaultWalker.walkRecursive(DefaultWalker.java:277)	at org.sonatype.nexus.proxy.walker.DefaultWalker.walk(DefaultWalker.java:149)	at org.sonatype.nexus.proxy.walker.DefaultWalker.walk(DefaultWalker.java:55)	at org.sonatype.nexus.maven.tasks.DefaultSnapshotRemover.removeSnapshotsFromMavenRepository(DefaultSnapshotRemover.java:180)	at org.sonatype.nexus.maven.tasks.DefaultSnapshotRemover.removeSnapshots(DefaultSnapshotRemover.java:121)	at org.sonatype.nexus.DefaultNexus.removeSnapshots(DefaultNexus.java:958)	at org.sonatype.nexus.maven.tasks.SnapshotRemoverTask.doRun(SnapshotRemoverTask.java:101)	at org.sonatype.nexus.maven.tasks.SnapshotRemoverTask.doRun(SnapshotRemoverTask.java:37)	at org.sonatype.nexus.scheduling.AbstractNexusTask.call(AbstractNexusTask.java:147)	at org.sonatype.scheduling.DefaultScheduledTask.call(DefaultScheduledTask.java:345)	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:269)	at java.util.concurrent.FutureTask.run(FutureTask.java:123)	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:65)	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:168)	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:650)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:675)	at java.lang.Thread.run(Thread.java:595)