java.util.ConcurrentModificationException
   at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:859)
   at java.util.ArrayList$Itr.next(ArrayList.java:831)
   at org.openide.util.actions.CookieAction$CookieDelegateAction.attachListeners(CookieAction.java:417)
   at org.openide.util.actions.CookieAction$CookieDelegateAction.setNodes(CookieAction.java:393)
   at org.openide.util.actions.CookieAction$CookieDelegateAction.resultChanged(CookieAction.java:345)
   at org.openide.util.actions.NodeAction$DelegateAction.<init>(NodeAction.java:560)
   at org.openide.util.actions.CookieAction$CookieDelegateAction.<init>(CookieAction.java:339)
   at org.openide.util.actions.CookieAction.createContextAwareInstance(CookieAction.java:157)
   at org.openide.loaders.TemplateWizard$DefaultIterator.instantiate(TemplateWizard.java:918)
   at org.openide.loaders.TemplateWizard.handleInstantiate(TemplateWizard.java:605)
   at org.openide.loaders.TemplateWizard.instantiateNewObjects(TemplateWizard.java:439)
   at org.openide.loaders.TemplateWizardIterImpl.instantiate(TemplateWizardIterImpl.java:248)
   at org.openide.loaders.TemplateWizardIteratorWrapper.instantiate(TemplateWizardIteratorWrapper.java:160)
   at org.openide.WizardDescriptor.callInstantiateOpen(WizardDescriptor.java:1629)
   at org.openide.WizardDescriptor.callInstantiate(WizardDescriptor.java:1570)
   at org.openide.WizardDescriptor.access$2300(WizardDescriptor.java:92)
   at org.openide.WizardDescriptor$Listener$2$1.run(WizardDescriptor.java:2257)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1425)
   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:2038)