java.lang.NoClassDefFoundError: org/netbeans/modules/scala/maven/MavenProjectOpenedHook
   at org.netbeans.modules.scala.maven.MavenProjectOpenedHookLookupProvider.createAdditionalLookup(MavenProjectOpenedHookLookupProvider.java:29)
   at org.netbeans.spi.project.support.DelegatingLookupImpl.doDelegate(DelegatingLookupImpl.java:139)
   at org.netbeans.spi.project.support.DelegatingLookupImpl.<init>(DelegatingLookupImpl.java:91)
   at org.netbeans.spi.project.support.LookupProviderSupport.createCompositeLookup(LookupProviderSupport.java:111)
   at org.netbeans.modules.maven.NbMavenProjectImpl.<init>(NbMavenProjectImpl.java:249)
   at org.netbeans.modules.maven.NbMavenProjectFactory.loadProject(NbMavenProjectFactory.java:119)
   at org.netbeans.modules.projectapi.nb.NbProjectManager.createProject(NbProjectManager.java:401)
   at org.netbeans.modules.projectapi.nb.NbProjectManager.access$300(NbProjectManager.java:94)
   at org.netbeans.modules.projectapi.nb.NbProjectManager$2.run(NbProjectManager.java:314)
   at org.netbeans.modules.projectapi.nb.NbProjectManager$2.run(NbProjectManager.java:243)
   at org.netbeans.modules.openide.util.DefaultMutexImplementation.readAccess(DefaultMutexImplementation.java:252)
   at org.openide.util.Mutex.readAccess(Mutex.java:250)
   at org.netbeans.modules.projectapi.nb.NbProjectManager.findProject(NbProjectManager.java:243)
   at org.netbeans.api.project.ProjectManager.findProject(ProjectManager.java:164)
   at org.netbeans.modules.projectapi.SimpleFileOwnerQueryImplementation.getOwner(SimpleFileOwnerQueryImplementation.java:145)
   at org.netbeans.modules.projectapi.SimpleFileOwnerQueryImplementation.getOwner(SimpleFileOwnerQueryImplementation.java:109)
   at org.netbeans.api.project.FileOwnerQuery.getOwner(FileOwnerQuery.java:147)
   at org.netbeans.modules.projectapi.ProjectSharabilityQuery2.getSharability(ProjectSharabilityQuery2.java:63)
   at org.netbeans.api.queries.SharabilityQuery.getSharability(SharabilityQuery.java:177)
   at org.netbeans.modules.subversion.Subversion.isIgnored(Subversion.java:426)
   at org.netbeans.modules.subversion.FileStatusCache.createMissingEntryFileInformation(FileStatusCache.java:1134)
   at org.netbeans.modules.subversion.FileStatusCache.createFileInformation(FileStatusCache.java:952)
   at org.netbeans.modules.subversion.FileStatusCache.refresh(FileStatusCache.java:592)
   at org.netbeans.modules.subversion.FileStatusCache.refresh(FileStatusCache.java:501)
   at org.netbeans.modules.subversion.FileStatusCache.cleanUp(FileStatusCache.java:798)
Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to: java.lang.NoClassDefFoundError: org/netbeans/modules/scala/maven/MavenProjectOpenedHook
   at org.openide.util.RequestProcessor$Task.schedule(RequestProcessor.java:1484)
   at org.netbeans.modules.versioning.util.DelayScanRegistry.isDelayed(DelayScanRegistry.java:100)
   at org.netbeans.modules.subversion.Subversion$2.run(Subversion.java:174)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1443)
   at org.netbeans.modules.openide.util.GlobalLookup.execute(GlobalLookup.java:68)
   at org.openide.util.lookup.Lookups.executeWith(Lookups.java:303)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2058)