java.lang.IllegalStateException: Assertion failed. WindowsAPI is required to be called from AWT thread only, see http://core.netbeans.org/proposals/threading/
	at org.netbeans.core.windows.WindowManagerImpl.assertEventDispatchThreadWeak(WindowManagerImpl.java:1244)
	at org.netbeans.core.windows.WindowManagerImpl.topComponentActivatedNodesChanged(WindowManagerImpl.java:1099)
	at org.openide.windows.TopComponent.setActivatedNodes(TopComponent.java:283)
	at org.netbeans.modules.form.FormDesigner.updateComponentInspector(FormDesigner.java:1317)
	at org.netbeans.modules.form.FormEditor$5.formChanged(FormEditor.java:731)
	at org.netbeans.modules.form.FormModel.fireEvents(FormModel.java:985)
	at org.netbeans.modules.form.FormModel$EventBroker.run(FormModel.java:1094)
	at org.netbeans.modules.form.FormModel$EventBroker.sendEventImmediately(FormModel.java:1052)
	at org.netbeans.modules.form.FormModel.sendEventImmediately(FormModel.java:1015)
	at org.netbeans.modules.form.FormModel.fireFormToBeSaved(FormModel.java:684)
	at org.netbeans.modules.form.FormEditor.saveFormData(FormEditor.java:314)
	at org.netbeans.modules.form.FormEditorSupport.saveDocument(FormEditorSupport.java:226)
	at org.netbeans.modules.java.JavaEditor$Save.save(JavaEditor.java:245)
	at org.netbeans.core.NbTopManager.saveAll(NbTopManager.java:271)
	at org.netbeans.core.NbTopManager.access$300(NbTopManager.java:68)
	at org.netbeans.core.NbTopManager$NbLifecycleManager.saveAll(NbTopManager.java:428)
	at org.apache.tools.ant.module.run.TargetExecutor.run(TargetExecutor.java:360)
[catch] at org.netbeans.core.execution.RunClassThread.run(RunClassThread.java:131)