java.lang.IllegalArgumentException: Deassign from wrong parent. Old: null Caller: org.openide.nodes.FilterNode$Children@270cb85b
   at org.openide.nodes.Node.deassignFrom(Node.java:395)
   at org.openide.nodes.EntrySupportLazy.removeEntries(EntrySupportLazy.java:835)
   at org.openide.nodes.EntrySupportLazy.refreshEntry(EntrySupportLazy.java:409)
   at org.openide.nodes.FilterNode$Children$LazySupport.doRefreshEntry(FilterNode.java:1872)
   at org.openide.nodes.FilterNode$Children$LazySupport.filterChildrenRemoved(FilterNode.java:1818)
   at org.openide.nodes.FilterNode$Children.filterChildrenRemoved(FilterNode.java:1608)
   at org.openide.nodes.FilterNode$ChildrenAdapter.childrenRemoved(FilterNode.java:2009)
   at org.openide.nodes.Node.fireSubNodesChangeIdx(Node.java:1192)
   at org.openide.nodes.EntrySupportLazy.fireSubNodesChangeIdx(EntrySupportLazy.java:618)
   at org.openide.nodes.EntrySupportLazy.removeEntries(EntrySupportLazy.java:828)
   at org.openide.nodes.EntrySupportLazy.refreshEntry(EntrySupportLazy.java:409)
   at org.openide.nodes.Children$Keys$1.run(Children.java:1478)
   at org.netbeans.modules.openide.util.DefaultMutexImplementation$1Exec.run(DefaultMutexImplementation.java:1016)
   at org.openide.nodes.Children$ProjectManagerDeadlockDetector.execute(Children.java:1938)
   at org.netbeans.modules.openide.util.DefaultMutexImplementation.postRequest(DefaultMutexImplementation.java:1022)
   at org.netbeans.modules.openide.util.DefaultMutexImplementation.postRequest(DefaultMutexImplementation.java:985)
   at org.netbeans.modules.openide.util.DefaultMutexImplementation.postWriteRequest(DefaultMutexImplementation.java:356)
   at org.openide.util.Mutex.postWriteRequest(Mutex.java:388)
   at org.openide.nodes.Children$Keys.refreshKey(Children.java:1475)
   at org.openide.loaders.FolderChildren.access$300(FolderChildren.java:73)
   at org.openide.loaders.FolderChildren$DelayedNode.run(FolderChildren.java:563)
   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)