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java.lang.NullPointerException: 	at org.xmlpull.mxp1.MXParser.fillBuf(MXParser.java:3020)	at org.xmlpull.mxp1.MXParser.more(MXParser.java:3046)	at org.xmlpull.mxp1.MXParser.parseStartTag(MXParser.java:1738)	at org.xmlpull.mxp1.MXParser.parseProlog(MXParser.java:1479)	at org.xmlpull.mxp1.MXParser.nextImpl(MXParser.java:1395)	at org.xmlpull.mxp1.MXParser.next(MXParser.java:1093)	at com.thoughtworks.xstream.io.xml.XppReader.pullNextEvent(XppReader.java:63)	at com.thoughtworks.xstream.io.xml.AbstractPullReader.readRealEvent(AbstractPullReader.java:137)	at com.thoughtworks.xstream.io.xml.AbstractPullReader.readEvent(AbstractPullReader.java:130)	at com.thoughtworks.xstream.io.xml.AbstractPullReader.move(AbstractPullReader.java:109)	at com.thoughtworks.xstream.io.xml.AbstractPullReader.moveDown(AbstractPullReader.java:94)	at com.thoughtworks.xstream.io.xml.XppReader.(XppReader.java:48)	at com.thoughtworks.xstream.io.xml.XppDriver.createReader(XppDriver.java:44)	at com.thoughtworks.xstream.io.xml.XppDriver.createReader(XppDriver.java:49)	at com.thoughtworks.xstream.XStream.fromXML(XStream.java:861)	at org.sonatype.nexus.proxy.attributes.DefaultAttributeStorage.doGetAttributes(DefaultAttributeStorage.java:294)	at org.sonatype.nexus.proxy.attributes.DefaultAttributeStorage.getAttributes(DefaultAttributeStorage.java:177)	at org.sonatype.nexus.proxy.attributes.DefaultAttributesHandler.fetchAttributes(DefaultAttributesHandler.java:138)	at org.sonatype.nexus.proxy.storage.local.fs.DefaultFSLocalRepositoryStorage.retrieveItemFromFile(DefaultFSLocalRepositoryStorage.java:240)	at org.sonatype.nexus.proxy.storage.local.fs.DefaultFSLocalRepositoryStorage.listItems(DefaultFSLocalRepositoryStorage.java:450)	at org.sonatype.nexus.proxy.repository.AbstractRepository.doListItems(AbstractRepository.java:1191)	at org.sonatype.nexus.proxy.repository.AbstractRepository.list(AbstractRepository.java:1008)	at org.sonatype.nexus.proxy.repository.AbstractRepository.list(AbstractRepository.java:1024)	at org.sonatype.nexus.proxy.walker.DefaultWalker.walkRecursive(DefaultWalker.java:234)	at org.sonatype.nexus.proxy.walker.DefaultWalker.walkRecursive(DefaultWalker.java:255)	at org.sonatype.nexus.proxy.walker.DefaultWalker.walkRecursive(DefaultWalker.java:255)	at org.sonatype.nexus.proxy.walker.DefaultWalker.walkRecursive(DefaultWalker.java:255)	at org.sonatype.nexus.proxy.walker.DefaultWalker.walkRecursive(DefaultWalker.java:255)	at org.sonatype.nexus.proxy.walker.DefaultWalker.walkRecursive(DefaultWalker.java:255)	at org.sonatype.nexus.proxy.walker.DefaultWalker.walk(DefaultWalker.java:128)	at org.sonatype.nexus.proxy.walker.DefaultWalker.walk(DefaultWalker.java:48)	at org.sonatype.nexus.maven.tasks.DefaultSnapshotRemover.removeSnapshotsFromMavenRepository(DefaultSnapshotRemover.java:176)	at org.sonatype.nexus.maven.tasks.DefaultSnapshotRemover.removeSnapshots(DefaultSnapshotRemover.java:98)	at org.sonatype.nexus.DefaultNexus.removeSnapshots(DefaultNexus.java:884)	at org.sonatype.nexus.maven.tasks.SnapshotRemoverTask.doRun(SnapshotRemoverTask.java:94)	at org.sonatype.nexus.maven.tasks.SnapshotRemoverTask.doRun(SnapshotRemoverTask.java:30)	at org.sonatype.nexus.scheduling.AbstractNexusTask.call(AbstractNexusTask.java:139)	at org.sonatype.scheduling.DefaultScheduledTask.call(DefaultScheduledTask.java:342)	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)	at java.util.concurrent.FutureTask.run(FutureTask.java:138)	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:98)	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:207)	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:619)