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This exception has no message.
java.lang.NullPointerException at org.sonatype.nexus.index.DefaultIndexerManager.reindexRepository(DefaultIndexerManager.java:478) at org.sonatype.nexus.index.DefaultIndexerManager.reindexRepository(DefaultIndexerManager.java:440) at org.sonatype.nexus.DefaultNexus.reindexRepository(DefaultNexus.java:1328) at org.sonatype.nexus.tasks.ReindexTask.doRun(ReindexTask.java:40) at org.sonatype.nexus.scheduling.AbstractNexusTask.call(AbstractNexusTask.java:139) at org.sonatype.scheduling.DefaultScheduledTask.call(DefaultScheduledTask.java:342) 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)