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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:1373) at org.netbeans.core.windows.WindowManagerImpl.findTopComponent(WindowManagerImpl.java:217) at org.netbeans.modules.nbplayer.module.PlayerWindowTopComponent.findInstance(PlayerWindowTopComponent.java:506) at org.netbeans.modules.nbplayer.module.Mp3ToolbarPanel.<init>(Mp3ToolbarPanel.java:33) at org.netbeans.modules.nbplayer.module.MP3PlayerToolbarAction.<init>(MP3PlayerToolbarAction.java:8) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) 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:619) at org.openide.util.SharedClassObject$SetAccessibleAction.run(SharedClassObject.java:979) at org.openide.util.SharedClassObject$SetAccessibleAction.run(SharedClassObject.java:971) at java.security.AccessController.doPrivileged(Native Method) at org.openide.util.SharedClassObject.findObject(SharedClassObject.java:493) at org.openide.loaders.InstanceSupport.instanceCreate(InstanceSupport.java:194) at org.openide.loaders.InstanceDataObject$Ser.instanceCreate(InstanceDataObject.java:1191) at org.openide.loaders.InstanceDataObject.instanceCreate(InstanceDataObject.java:694) at org.netbeans.modules.options.keymap.LayersBridge.createAction(LayersBridge.java:334) at org.netbeans.modules.options.keymap.LayersBridge.initActions(LayersBridge.java:128) at org.netbeans.modules.options.keymap.LayersBridge.initActions(LayersBridge.java:92) at org.netbeans.modules.options.keymap.LayersBridge.getActions(LayersBridge.java:73) at org.netbeans.modules.options.keymap.KeymapModel.getActionCategories(KeymapModel.java:48) at org.netbeans.modules.options.keymap.KeymapModel.<init>(KeymapModel.java:253) at org.netbeans.modules.options.keymap.KeymapViewModel.<init>(KeymapViewModel.java:61) at org.netbeans.modules.options.keymap.KeymapPanel.getModel(KeymapPanel.java:332) at org.netbeans.modules.options.keymap.KeymapPanelController.getLookup(KeymapPanelController.java:63) at org.netbeans.modules.options.CategoryModel$Category.getLookup(CategoryModel.java:382) at org.netbeans.modules.options.CategoryModel$Category.access$000(CategoryModel.java:271) at org.netbeans.modules.options.CategoryModel$1.run(CategoryModel.java:65) at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:541) [catch] at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:963)
Module nbplayer is guilty, exception says it all - window system must be called from EQ thread. Passing to proper owner - please change category, I don't know where nbplayer belongs.