java.lang.AssertionError: java.lang.ClassNotFoundException: org.netbeans.spi.java.project.support.ui.PackageViewChildren$PackageNode starting from org.netbeans.StandardModule$OneModuleClassLoader@aa2ef2[org.netbeans.modules.python.project] with possible defining loaders null and declared parents [org.netbeans.StandardModule$OneModuleClassLoader@83e5f1[org.netbeans.modules.python.debugger], org.netbeans.StandardModule$OneModuleClassLoader@6691da[org.openide.windows], org.netbeans.StandardModule$OneModuleClassLoader@10d4f27[org.netbeans.modules.queries], org.netbeans.StandardModule$OneModuleClassLoader@18baf36[org.netbeans.modules.project.ant], org.netbeans.StandardModule$OneModuleClassLoader@1a3e41f[org.netbeans.modules.projectuiapi], org.netbeans.StandardModule$OneModuleClassLoader@e2d0b2[org.netbeans.modules.projectapi], org.netbeans.StandardModule$OneModuleClassLoader@bfd10a[org.openidex.util], org.netbeans.StandardModule$OneModuleClassLoader@c135d6[org.netbeans.modules.gsfpath.api], org.netbeans.StandardMo at org.netbeans.modules.python.project.ui.PackageViewChildren$PackageNode.clipboardCut(PackageViewChildren.java:714) at org.openide.nodes.FilterNode.clipboardCut(FilterNode.java:646) at org.openide.explorer.view.DragDropUtilities.getNodeTransferable(DragDropUtilities.java:132) at org.openide.explorer.view.ExplorerDragSupport.dragGestureRecognized(ExplorerDragSupport.java:135) at org.openide.explorer.view.TreeViewDragSupport.dragGestureRecognized(TreeViewDragSupport.java:89) at java.awt.dnd.DragGestureRecognizer.fireDragGestureRecognized(DragGestureRecognizer.java:339) at sun.awt.windows.WMouseDragGestureRecognizer.mouseDragged(WMouseDragGestureRecognizer.java:202) at java.awt.AWTEventMulticaster.mouseDragged(AWTEventMulticaster.java:303) at java.awt.AWTEventMulticaster.mouseDragged(AWTEventMulticaster.java:302) at java.awt.AWTEventMulticaster.mouseDragged(AWTEventMulticaster.java:302) at java.awt.Component.processMouseMotionEvent(Component.java:6182) at javax.swing.JComponent.processMouseMotionEvent(JComponent.java:3283) at java.awt.Component.processEvent(Component.java:5903) at java.awt.Container.processEvent(Container.java:2023) at java.awt.Component.dispatchEventImpl(Component.java:4501) at java.awt.Container.dispatchEventImpl(Container.java:2081) at java.awt.Component.dispatchEvent(Component.java:4331) at java.awt.LightweightDispatcher.retargetMouseEvent(LightweightDispatcher.java:4301) at java.awt.LightweightDispatcher.processMouseEvent(LightweightDispatcher.java:3982) at java.awt.LightweightDispatcher.dispatchEvent(LightweightDispatcher.java:3895) at java.awt.Container.dispatchEventImpl(Container.java:2067) at java.awt.Window.dispatchEventImpl(Window.java:2458) at java.awt.Component.dispatchEvent(Component.java:4331) at java.awt.EventQueue.dispatchEvent(EventQueue.java:599) at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:104) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161) at java.awt.EventDispatchThread.run(EventDispatchThread.java:122) java.lang.ClassNotFoundException: org.netbeans.spi.java.project.support.ui.PackageViewChildren$PackageNode starting from org.netbeans.StandardModule$OneModuleClassLoader@aa2ef2[org.netbeans.modules.python.project] with possible defining loaders null and declared parents [org.netbeans.StandardModule$OneModuleClassLoader@83e5f1[org.netbeans.modules.python.debugger], org.netbeans.StandardModule$OneModuleClassLoader@6691da[org.openide.windows], org.netbeans.StandardModule$OneModuleClassLoader@10d4f27[org.netbeans.modules.queries], org.netbeans.StandardModule$OneModuleClassLoader@18baf36[org.netbeans.modules.project.ant], org.netbeans.StandardModule$OneModuleClassLoader@1a3e41f[org.netbeans.modules.projectuiapi], org.netbeans.StandardModule$OneModuleClassLoader@e2d0b2[org.netbeans.modules.projectapi], org.netbeans.StandardModule$OneModuleClassLoader@bfd10a[org.openidex.util], org.netbeans.StandardModule$OneModuleClassLoader@c135d6[org.netbeans.modules.gsfpath.api], org.netbeans.StandardModule$OneModuleClassLoader@ at org.netbeans.ProxyClassLoader.loadClass(ProxyClassLoader.java:254) at java.lang.ClassLoader.loadClass(ClassLoader.java:252) at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320) at java.lang.Class.forName0(Class.java:0) at java.lang.Class.forName(Class.java:247) at java.awt.datatransfer.DataFlavor.tryToLoadClass(DataFlavor.java:119) at java.awt.datatransfer.DataFlavor.initialize(DataFlavor.java:445) at java.awt.datatransfer.DataFlavor.(DataFlavor.java:381) at org.netbeans.modules.python.project.ui.PackageViewChildren$PackageTransferable.(PackageViewChildren.java:1182) at org.netbeans.modules.python.project.ui.PackageViewChildren$PackageNode.clipboardCut(PackageViewChildren.java:712) at org.openide.nodes.FilterNode.clipboardCut(FilterNode.java:646) at org.openide.explorer.view.DragDropUtilities.getNodeTransferable(DragDropUtilities.java:132) at org.openide.explorer.view.ExplorerDragSupport.dragGestureRecognized(ExplorerDragSupport.java:135) at org.openide.explorer.view.TreeViewDragSupport.dragGestureRecognized(TreeViewDragSupport.java:89) at java.awt.dnd.DragGestureRecognizer.fireDragGestureRecognized(DragGestureRecognizer.java:339) at sun.awt.windows.WMouseDragGestureRecognizer.mouseDragged(WMouseDragGestureRecognizer.java:202) at java.awt.AWTEventMulticaster.mouseDragged(AWTEventMulticaster.java:303) at java.awt.AWTEventMulticaster.mouseDragged(AWTEventMulticaster.java:302) at java.awt.AWTEventMulticaster.mouseDragged(AWTEventMulticaster.java:302) at java.awt.Component.processMouseMotionEvent(Component.java:6182) at javax.swing.JComponent.processMouseMotionEvent(JComponent.java:3283) at java.awt.Component.processEvent(Component.java:5903) at java.awt.Container.processEvent(Container.java:2023) at java.awt.Component.dispatchEventImpl(Component.java:4501) at java.awt.Container.dispatchEventImpl(Container.java:2081) at java.awt.Component.dispatchEvent(Component.java:4331) at java.awt.LightweightDispatcher.retargetMouseEvent(LightweightDispatcher.java:4301) at java.awt.LightweightDispatcher.processMouseEvent(LightweightDispatcher.java:3982) at java.awt.LightweightDispatcher.dispatchEvent(LightweightDispatcher.java:3895) at java.awt.Container.dispatchEventImpl(Container.java:2067) at java.awt.Window.dispatchEventImpl(Window.java:2458) at java.awt.Component.dispatchEvent(Component.java:4331) at java.awt.EventQueue.dispatchEvent(EventQueue.java:599) at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:104) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161) at java.awt.EventDispatchThread.run(EventDispatchThread.java:122) java.lang.ClassNotFoundException: org.netbeans.spi.java.project.support.ui.PackageViewChildren$PackageNode at java.net.URLClassLoader$1.run(URLClassLoader.java:200) at java.security.AccessController.doPrivileged(AccessController.java:0) at java.net.URLClassLoader.findClass(URLClassLoader.java:188) at java.lang.ClassLoader.loadClass(ClassLoader.java:307) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) at java.lang.ClassLoader.loadClass(ClassLoader.java:252) at org.netbeans.ProxyClassLoader.loadClass(ProxyClassLoader.java:252) at java.lang.ClassLoader.loadClass(ClassLoader.java:252) at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320) at java.lang.Class.forName0(Class.java:0) at java.lang.Class.forName(Class.java:247) at java.awt.datatransfer.DataFlavor.tryToLoadClass(DataFlavor.java:119) at java.awt.datatransfer.DataFlavor.initialize(DataFlavor.java:445) at java.awt.datatransfer.DataFlavor.(DataFlavor.java:381) at org.netbeans.modules.python.project.ui.PackageViewChildren$PackageTransferable.(PackageViewChildren.java:1182) at org.netbeans.modules.python.project.ui.PackageViewChildren$PackageNode.clipboardCut(PackageViewChildren.java:712) at org.openide.nodes.FilterNode.clipboardCut(FilterNode.java:646) at org.openide.explorer.view.DragDropUtilities.getNodeTransferable(DragDropUtilities.java:132) at org.openide.explorer.view.ExplorerDragSupport.dragGestureRecognized(ExplorerDragSupport.java:135) at org.openide.explorer.view.TreeViewDragSupport.dragGestureRecognized(TreeViewDragSupport.java:89) at java.awt.dnd.DragGestureRecognizer.fireDragGestureRecognized(DragGestureRecognizer.java:339) at sun.awt.windows.WMouseDragGestureRecognizer.mouseDragged(WMouseDragGestureRecognizer.java:202) at java.awt.AWTEventMulticaster.mouseDragged(AWTEventMulticaster.java:303) at java.awt.AWTEventMulticaster.mouseDragged(AWTEventMulticaster.java:302) at java.awt.AWTEventMulticaster.mouseDragged(AWTEventMulticaster.java:302) at java.awt.Component.processMouseMotionEvent(Component.java:6182) at javax.swing.JComponent.processMouseMotionEvent(JComponent.java:3283) at java.awt.Component.processEvent(Component.java:5903) at java.awt.Container.processEvent(Container.java:2023) at java.awt.Component.dispatchEventImpl(Component.java:4501) at java.awt.Container.dispatchEventImpl(Container.java:2081) at java.awt.Component.dispatchEvent(Component.java:4331) at java.awt.LightweightDispatcher.retargetMouseEvent(LightweightDispatcher.java:4301) at java.awt.LightweightDispatcher.processMouseEvent(LightweightDispatcher.java:3982) at java.awt.LightweightDispatcher.dispatchEvent(LightweightDispatcher.java:3895) at java.awt.Container.dispatchEventImpl(Container.java:2067) at java.awt.Window.dispatchEventImpl(Window.java:2458) at java.awt.Component.dispatchEvent(Component.java:4331) at java.awt.EventQueue.dispatchEvent(EventQueue.java:599) at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:104) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161) at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)