java.lang.IllegalStateException: Problem in some module which uses Window System: Window System API is required to be called from AWT thread only, see http://core.netbeans.org/proposals/threading/
   at org.netbeans.core.windows.WindowManagerImpl.warnIfNotInEDT(WindowManagerImpl.java:1520)
   at org.netbeans.core.windows.WindowManagerImpl.getMainWindow(WindowManagerImpl.java:160)
   at org.netbeans.modules.desktopsampler.ui.DesktopSampler.<init>(DesktopSampler.java:110)
   at org.netbeans.modules.desktopsampler.ui.DesktopSamplerAction.<init>(DesktopSamplerAction.java:31)
   at sun.reflect.NativeConstructorAccessorImpl.newInstance0(NativeConstructorAccessorImpl.java:0)
   at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
   at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
   at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
   at org.openide.util.SharedClassObject.createInstancePrivileged(SharedClassObject.java:658)
   at org.openide.util.SharedClassObject$SetAccessibleAction.run(SharedClassObject.java:1018)
   at org.openide.util.SharedClassObject$SetAccessibleAction.run(SharedClassObject.java:1010)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at org.openide.util.SharedClassObject.findObject(SharedClassObject.java:532)
   at org.openide.loaders.InstanceSupport.instanceCreate(InstanceSupport.java:217)
   at org.openide.loaders.InstanceDataObject$Ser.instanceCreate(InstanceDataObject.java:1383)
   at org.openide.loaders.InstanceDataObject.instanceCreate(InstanceDataObject.java:821)
   at org.openide.loaders.FolderInstance.instanceForCookie(FolderInstance.java:588)
   at org.openide.awt.Toolbar$Folder.instanceForCookie(Toolbar.java:358)
   at org.openide.loaders.FolderInstance$HoldInstance.instanceCreate(FolderInstance.java:1138)
   at org.openide.loaders.FolderInstance$1R.instances(FolderInstance.java:708)
   at org.openide.loaders.FolderInstance$1R.run(FolderInstance.java:729)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1418)
   at org.openide.util.RequestProcessor$Processor.doEvaluate(RequestProcessor.java:2001)
   at org.openide.util.RequestProcessor$Task.waitFinished(RequestProcessor.java:1650)
   at org.openide.loaders.FolderInstance$1R.waitFinished(FolderInstance.java:744)
   at org.openide.loaders.FolderInstance.waitFinished(FolderInstance.java:350)
   at org.openide.loaders.FolderInstance.instanceCreate(FolderInstance.java:282)
   at org.openide.loaders.FolderInstance.instanceForCookie(FolderInstance.java:588)
   at org.openide.loaders.FolderInstance$HoldInstance.instanceCreate(FolderInstance.java:1138)
   at org.openide.loaders.FolderInstance$1R.instances(FolderInstance.java:708)
   at org.openide.loaders.FolderInstance$1R.run(FolderInstance.java:729)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1418)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1957)