java.io.IOException: File C:\Users\tsparg\.netbeans\dev\var\cache\mavenindex\local\_j.cfs unable to be deleted.
   at org.codehaus.plexus.util.FileUtils.forceDelete(FileUtils.java:1373)
   at org.codehaus.plexus.util.FileUtils.cleanDirectory(FileUtils.java:1625)
   at org.codehaus.plexus.util.FileUtils.deleteDirectory(FileUtils.java:1570)
   at org.netbeans.modules.maven.indexer.NexusRepositoryIndexerImpl.loadIndexingContext(NexusRepositoryIndexerImpl.java:366)
   at org.netbeans.modules.maven.indexer.NexusRepositoryIndexerImpl.access$500(NexusRepositoryIndexerImpl.java:176)
   at org.netbeans.modules.maven.indexer.NexusRepositoryIndexerImpl$10.run(NexusRepositoryIndexerImpl.java:905)
   at org.netbeans.modules.maven.indexer.NexusRepositoryIndexerImpl$10.run(NexusRepositoryIndexerImpl.java:903)
Caused: org.openide.util.MutexException: java.io.IOException: File C:\Users\tsparg\.netbeans\dev\var\cache\mavenindex\local\_j.cfs unable to be deleted.
   at org.openide.util.Mutex.writeAccess(Mutex.java:440)
   at org.netbeans.modules.maven.indexer.NexusRepositoryIndexerImpl.getVersions(NexusRepositoryIndexerImpl.java:903)
   at org.netbeans.modules.maven.indexer.api.RepositoryQueries.getVersions(RepositoryQueries.java:144)
   at org.netbeans.modules.maven.hints.pom.ParentVersionError.getErrorsForDocument(ParentVersionError.java:137)
   at org.netbeans.modules.maven.hints.pom.StatusProvider$StatusProviderImpl$3.run(StatusProvider.java:197)
   at org.netbeans.modules.maven.hints.pom.StatusProvider$StatusProviderImpl$3.run(StatusProvider.java:181)
   at org.openide.util.Mutex.readAccess(Mutex.java:288)
   at org.netbeans.modules.maven.hints.pom.StatusProvider$StatusProviderImpl.findHints(StatusProvider.java:181)
   at org.netbeans.modules.maven.hints.pom.StatusProvider$StatusProviderImpl.checkHints(StatusProvider.java:152)
   at org.netbeans.modules.maven.hints.pom.StatusProvider$StatusProviderImpl.access$000(StatusProvider.java:122)
   at org.netbeans.modules.maven.hints.pom.StatusProvider$StatusProviderImpl$2.run(StatusProvider.java:145)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1424)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1973)