Nexus: Task execution failure

Task ID: 5
Task Name: Snapshot Remover
Stack trace: 
org.sonatype.nexus.proxy.walker.WalkerException: Aborted walking on repository ID='snapshots' from path='/'.
	at org.sonatype.nexus.proxy.walker.DefaultWalker.reportWalkEnd(DefaultWalker.java:163)
	at org.sonatype.nexus.proxy.walker.DefaultWalker.walk(DefaultWalker.java:123)
	at org.sonatype.nexus.maven.tasks.DefaultSnapshotRemover.removeSnapshotsFromMavenRepository(DefaultSnapshotRemover.java:206)
	at org.sonatype.nexus.maven.tasks.DefaultSnapshotRemover.process(DefaultSnapshotRemover.java:151)
	at org.sonatype.nexus.maven.tasks.DefaultSnapshotRemover.removeSnapshots(DefaultSnapshotRemover.java:105)
	at org.sonatype.nexus.DefaultNexus.removeSnapshots(DefaultNexus.java:446)
	at org.sonatype.nexus.maven.tasks.SnapshotRemoverTask.doRun(SnapshotRemoverTask.java:101)
	at org.sonatype.nexus.maven.tasks.SnapshotRemoverTask.doRun(SnapshotRemoverTask.java:32)
	at org.sonatype.nexus.scheduling.AbstractNexusTask.call(AbstractNexusTask.java:192)
	at org.sonatype.scheduling.DefaultScheduledTask.call(DefaultScheduledTask.java:338)
	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
	at java.util.concurrent.FutureTask.run(FutureTask.java:138)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:98)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:206)
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
	at java.lang.Thread.run(Thread.java:662)
Caused by: java.lang.IllegalStateException: The path-cache Cache is not alive.
	at net.sf.ehcache.Cache.checkStatus(Cache.java:1707)
	at net.sf.ehcache.Cache.get(Cache.java:899)
	at net.sf.ehcache.Cache.get(Cache.java:880)
	at org.sonatype.nexus.proxy.cache.EhCachePathCache.doContains(EhCachePathCache.java:67)
	at org.sonatype.nexus.proxy.cache.AbstractPathCache.contains(AbstractPathCache.java:29)
	at org.sonatype.nexus.proxy.repository.AbstractRepository.maintainNotFoundCache(AbstractRepository.java:1090)
	at org.sonatype.nexus.proxy.repository.AbstractRepository.list(AbstractRepository.java:1055)
	at org.sonatype.nexus.proxy.walker.DefaultWalker.walkRecursive(DefaultWalker.java:228)
	at org.sonatype.nexus.proxy.walker.DefaultWalker.walkRecursive(DefaultWalker.java:249)
	at org.sonatype.nexus.proxy.walker.DefaultWalker.walkRecursive(DefaultWalker.java:249)
	at org.sonatype.nexus.proxy.walker.DefaultWalker.walkRecursive(DefaultWalker.java:249)
	at org.sonatype.nexus.proxy.walker.DefaultWalker.walkRecursive(DefaultWalker.java:249)
	at org.sonatype.nexus.proxy.walker.DefaultWalker.walk(DefaultWalker.java:115)
	... 15 more