java.lang.AbstractMethodError: org.netbeans.modules.websvc.rest.spi.RestSupport.upgrade()V
   at org.netbeans.modules.websvc.rest.RestUtils.upgrade(RestUtils.java:92)
   at org.netbeans.modules.websvc.rest.nodes.RestServicesNodeFactory.createNodes(RestServicesNodeFactory.java:92)
   at org.netbeans.spi.project.ui.support.NodeFactorySupport$DelegateChildren$1.run(NodeFactorySupport.java:199)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1452)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2032)
Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to: java.lang.AbstractMethodError: org.netbeans.modules.websvc.rest.spi.RestSupport.upgrade()V
   at org.openide.util.RequestProcessor.post(RequestProcessor.java:424)
   at org.netbeans.spi.project.ui.support.NodeFactorySupport$DelegateChildren.addNotify(NodeFactorySupport.java:194)
   at org.openide.nodes.Children.callAddNotify(Children.java:575)
   at org.openide.nodes.EntrySupport$Default.getArray(EntrySupport.java:770)
   at org.openide.nodes.EntrySupport$Default.getNodes(EntrySupport.java:172)
   at org.openide.nodes.EntrySupport$Default.getNodes(EntrySupport.java:228)
   at org.openide.nodes.Children.getNodes(Children.java:469)
   at org.openide.nodes.FilterNode$Children$DefaultSupport.updateKeys(FilterNode.java:1699)
   at org.openide.nodes.FilterNode$Children$DefaultSupport.update(FilterNode.java:1686)
   at org.openide.nodes.FilterNode$Children.addNotifyImpl(FilterNode.java:1477)
   at org.openide.nodes.FilterNode$Children.addNotify(FilterNode.java:1470)
   at org.openide.nodes.Children.callAddNotify(Children.java:575)
   at org.openide.nodes.EntrySupport$Default.getArray(EntrySupport.java:770)
   at org.openide.nodes.EntrySupport$Default.getNodes(EntrySupport.java:172)
   at org.openide.nodes.EntrySupport$Default.snapshot(EntrySupport.java:149)
   at org.openide.nodes.Children.snapshot(Children.java:532)
   at org.openide.explorer.view.TreeView.expandNode(TreeView.java:608)
   at org.netbeans.modules.project.ui.ProjectTab.expandNode(ProjectTab.java:642)
   at org.netbeans.modules.project.ui.ProjectUtilities$2.run(ProjectUtilities.java:250)
   at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
   at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:646)
   at java.awt.EventQueue.access$000(EventQueue.java:84)
   at java.awt.EventQueue$1.run(EventQueue.java:607)
   at java.awt.EventQueue$1.run(EventQueue.java:605)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:616)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:158)
   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)