java.lang.IllegalArgumentException: failed to parse:application/x-java-openide-nodednd;class=org.openide.nodes.Node;mask=? at java.awt.datatransfer.DataFlavor.(DataFlavor.java:400) Caused: java.lang.IllegalStateException: Cannot createDndFlavor(1) at org.openide.nodes.NodeTransfer.createDndFlavor(NodeTransfer.java:136) at org.openide.nodes.NodeTransfer.transferable(NodeTransfer.java:147) at org.openide.nodes.AbstractNode.clipboardCopy(AbstractNode.java:473) at org.openide.loaders.DataNode.clipboardCopy(DataNode.java:620) at org.openide.loaders.DataFolder$FolderNode.createNodeTransferable(DataFolder.java:1429) at org.openide.loaders.DataFolder$FolderNode.createPasteTypes(DataFolder.java:1402) at org.openide.nodes.AbstractNode.getPasteTypes(AbstractNode.java:543) at org.netbeans.spi.java.project.support.ui.PackageRootNode.createPasteTypes(PackageRootNode.java:323) at org.openide.nodes.AbstractNode.getPasteTypes(AbstractNode.java:543) at org.openide.nodes.FilterNode.getPasteTypes(FilterNode.java:695) at org.openide.nodes.FilterNode.getPasteTypes(FilterNode.java:695) at org.openide.nodes.FilterNode.getPasteTypes(FilterNode.java:695) at org.netbeans.modules.openide.explorer.ExplorerActionsImpl.updatePasteTypes(ExplorerActionsImpl.java:360) at org.netbeans.modules.openide.explorer.ExplorerActionsImpl.updatePasteAction(ExplorerActionsImpl.java:346) at org.netbeans.modules.openide.explorer.ExplorerActionsImpl.updateActions(ExplorerActionsImpl.java:287) at org.netbeans.modules.openide.explorer.ExplorerActionsImpl$ActionStateUpdater.run(ExplorerActionsImpl.java:803) Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to: java.lang.IllegalStateException: Cannot createDndFlavor(1) at org.openide.util.RequestProcessor$Task.schedule(RequestProcessor.java:1495) at org.netbeans.modules.openide.explorer.ExplorerActionsImpl$ActionStateUpdater.schedule(ExplorerActionsImpl.java:835) at org.netbeans.modules.openide.explorer.ExplorerActionsImpl$ActionStateUpdater.flavorsChanged(ExplorerActionsImpl.java:794) at sun.reflect.GeneratedMethodAccessor61.invoke(GeneratedMethodAccessor61.java:0) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:601) at org.openide.util.WeakListenerImpl$ProxyListener.invoke(WeakListenerImpl.java:457) at $Proxy16.flavorsChanged(.java:0) at org.netbeans.NbClipboard.fireChange(NbClipboard.java:329) at org.netbeans.NbClipboard$GetContents.run(NbClipboard.java:423) at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1454) at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2036)