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java.lang.Exception: null	at org.sonatype.nexus.index.DefaultIndexerManager$18.run(DefaultIndexerManager.java:2483)	at org.sonatype.nexus.index.DefaultIndexerManager.exclusiveSingle(DefaultIndexerManager.java:2538)	at org.sonatype.nexus.index.DefaultIndexerManager.temporary(DefaultIndexerManager.java:2466)	at org.sonatype.nexus.index.DefaultIndexerManager.reindexRepository(DefaultIndexerManager.java:1044)	at org.sonatype.nexus.index.DefaultIndexerManager.reindexAllRepositories(DefaultIndexerManager.java:915)	at org.sonatype.nexus.tasks.ReindexTaskHandlerLegacy.reindexAllRepositories(ReindexTaskHandlerLegacy.java:41)	at org.sonatype.nexus.tasks.AbstractIndexerTask.doRun(AbstractIndexerTask.java:73)	at org.sonatype.nexus.scheduling.AbstractNexusTask.call(AbstractNexusTask.java:166)	at org.sonatype.scheduling.DefaultScheduledTask.call(DefaultScheduledTask.java:459)