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:1552)
        at org.netbeans.core.windows.WindowManagerImpl.getMainWindow(WindowManagerImpl.java:157)
        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:641)
        at org.openide.util.SharedClassObject$SetAccessibleAction.run(SharedClassObject.java:1001)
        at org.openide.util.SharedClassObject$SetAccessibleAction.run(SharedClassObject.java:993)
        at java.security.AccessController.doPrivileged(AccessController.java:0)
        at org.openide.util.SharedClassObject.findObject(SharedClassObject.java:515)
        at org.openide.loaders.InstanceSupport.instanceCreate(InstanceSupport.java:214)
        at org.openide.loaders.InstanceDataObject$Ser.instanceCreate(InstanceDataObject.java:1315)
        at org.openide.loaders.InstanceDataObject.instanceCreate(InstanceDataObject.java:777)
        at org.openide.loaders.FolderInstance.instanceForCookie(FolderInstance.java:585)
        at org.openide.awt.Toolbar$Folder.instanceForCookie(Toolbar.java:360)
        at org.openide.loaders.FolderInstance$HoldInstance.instanceCreate(FolderInstance.java:1135)
        at org.openide.loaders.FolderInstance$1R.instances(FolderInstance.java:705)
        at org.openide.loaders.FolderInstance$1R.run(FolderInstance.java:726)
        at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:602)
        at org.openide.util.RequestProcessor$Processor.doEvaluate(RequestProcessor.java:1112)
        at org.openide.util.RequestProcessor$Task.waitFinished(RequestProcessor.java:769)
        at org.openide.loaders.FolderInstance$1R.waitFinished(FolderInstance.java:741)
        at org.openide.loaders.FolderInstance.waitFinished(FolderInstance.java:347)
        at org.openide.loaders.FolderInstance.instanceCreate(FolderInstance.java:279)
        at org.openide.loaders.FolderInstance.instanceForCookie(FolderInstance.java:585)
        at org.openide.loaders.FolderInstance$HoldInstance.instanceCreate(FolderInstance.java:1135)
        at org.openide.loaders.FolderInstance$1R.instances(FolderInstance.java:705)
        at org.openide.loaders.FolderInstance$1R.run(FolderInstance.java:726)
        at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:602)
        at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1070)