java.lang.IllegalArgumentException: button doesn't exist 12
        at java.awt.event.InputEvent.getMaskForButton(InputEvent.java:233)
        at java.awt.Robot.<init>(Robot.java:101)
        at org.netbeans.core.windows.view.ui.WindowSnapper.<init>(WindowSnapper.java:66)
        at org.netbeans.core.windows.view.ui.DefaultSeparateContainer$ModeDialog.<init>(DefaultSeparateContainer.java:262)
        at org.netbeans.core.windows.view.ui.DefaultSeparateContainer.<init>(DefaultSeparateContainer.java:92)
        at org.netbeans.core.windows.view.ModeView.<init>(ModeView.java:92)
        at org.netbeans.core.windows.view.ViewHierarchy.updateViewForAccessor(ViewHierarchy.java:293)
        at org.netbeans.core.windows.view.ViewHierarchy.updateSeparateViews(ViewHierarchy.java:318)
        at org.netbeans.core.windows.view.ViewHierarchy.updateViewHierarchy(ViewHierarchy.java:155)
        at org.netbeans.core.windows.view.DefaultView.changeGUI(DefaultView.java:149)
        at org.netbeans.core.windows.ViewRequestor.dispatchRequest(ViewRequestor.java:269)
        at org.netbeans.core.windows.ViewRequestor.processRequest(ViewRequestor.java:245)
        at org.netbeans.core.windows.ViewRequestor.postRequest(ViewRequestor.java:183)
        at org.netbeans.core.windows.ViewRequestor.scheduleRequest(ViewRequestor.java:123)
        at org.netbeans.core.windows.Central.activateModeTopComponent(Central.java:1753)
        at org.netbeans.core.windows.WindowManagerImpl.topComponentRequestActive(WindowManagerImpl.java:1180)
        at org.openide.windows.TopComponent.requestActive(TopComponent.java:789)
        at org.netbeans.modules.debugger.ui.views.View.requestActive(View.java:180)
        at org.netbeans.modules.debugger.ui.actions.ViewActions.openComponent(ViewActions.java:87)
        at org.netbeans.modules.debugger.ui.actions.ViewActions.actionPerformed(ViewActions.java:77)
        at org.openide.awt.AlwaysEnabledAction.actionPerformed(AlwaysEnabledAction.java:115)
        at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2015)
        at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2338)
        at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
        at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
        at javax.swing.AbstractButton.doClick(AbstractButton.java:376)
        at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:829)
        at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:873)
        at java.awt.Component.processMouseEvent(Component.java:6260)
        at javax.swing.JComponent.processMouseEvent(JComponent.java:3309)
        at java.awt.Component.processEvent(Component.java:6025)
        at java.awt.Container.processEvent(Container.java:2083)
        at java.awt.Component.dispatchEventImpl(Component.java:4620)
        at java.awt.Container.dispatchEventImpl(Container.java:2141)
        at java.awt.Component.dispatchEvent(Component.java:4446)
        at java.awt.LightweightDispatcher.retargetMouseEvent(LightweightDispatcher.java:4663)
        at java.awt.LightweightDispatcher.processMouseEvent(LightweightDispatcher.java:4326)
        at java.awt.LightweightDispatcher.dispatchEvent(LightweightDispatcher.java:4256)
        at java.awt.Container.dispatchEventImpl(Container.java:2127)
        at java.awt.Window.dispatchEventImpl(Window.java:2612)
        at java.awt.Component.dispatchEvent(Component.java:4446)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:605)
        at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:104)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:286)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:201)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:191)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:186)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:178)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:139)