java.lang.NullPointerException
   at com.sun.tools.jdi.MirrorImpl.validateMirror(MirrorImpl.java:67)
   at com.sun.tools.jdi.ClassTypeImpl.setValue(ClassTypeImpl.java:124)
   at org.netbeans.modules.debugger.jpda.jdi.ClassTypeWrapper.setValue(ClassTypeWrapper.java:469)
   at org.netbeans.modules.debugger.jpda.visual.RemoteServices.clearPreferredEQThread(RemoteServices.java:346)
   at org.netbeans.modules.debugger.jpda.visual.RemoteServices.runOnStoppedThread(RemoteServices.java:528)
   at org.netbeans.modules.debugger.jpda.visual.RemoteFXScreenshot.take(RemoteFXScreenshot.java:235)
   at org.netbeans.modules.debugger.jpda.visual.RemoteFXScreenshot.takeCurrent(RemoteFXScreenshot.java:202)
   at org.netbeans.modules.debugger.jpda.visual.actions.TakeScreenshotActionProvider.doAction(TakeScreenshotActionProvider.java:135)
   at org.netbeans.spi.debugger.ActionsProvider$1.run(ActionsProvider.java:130)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1423)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2033)
Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to: java.lang.NullPointerException
   at org.openide.util.RequestProcessor.post(RequestProcessor.java:419)
   at org.netbeans.spi.debugger.ActionsProvider.postAction(ActionsProvider.java:126)
   at org.netbeans.spi.debugger.ActionsProvider$ContextAware.postAction(ActionsProvider.java:257)
   at org.netbeans.api.debugger.ActionsManager.postAction(ActionsManager.java:250)
   at org.netbeans.modules.debugger.ui.actions.DebuggerAction.actionPerformed(DebuggerAction.java:104)
   at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)
   at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2346)
   at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
   at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
   at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
   at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:290)
   at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:289)
   at java.awt.Component.processMouseEvent(Component.java:6527)
   at javax.swing.JComponent.processMouseEvent(JComponent.java:3321)
   at java.awt.Component.processEvent(Component.java:6292)
   at java.awt.Container.processEvent(Container.java:2234)
   at java.awt.Component.dispatchEventImpl(Component.java:4883)
   at java.awt.Container.dispatchEventImpl(Container.java:2292)
   at java.awt.Component.dispatchEvent(Component.java:4705)
   at java.awt.LightweightDispatcher.retargetMouseEvent(LightweightDispatcher.java:4898)
   at java.awt.LightweightDispatcher.processMouseEvent(LightweightDispatcher.java:4533)
   at java.awt.LightweightDispatcher.dispatchEvent(LightweightDispatcher.java:4462)
   at java.awt.Container.dispatchEventImpl(Container.java:2278)
   at java.awt.Window.dispatchEventImpl(Window.java:2739)
   at java.awt.Component.dispatchEvent(Component.java:4705)
   at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:746)
   at java.awt.EventQueue.access$400(EventQueue.java:97)
   at java.awt.EventQueue$3.run(EventQueue.java:697)
   at java.awt.EventQueue$3.run(EventQueue.java:691)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:86)
   at java.awt.EventQueue$4.run(EventQueue.java:719)
   at java.awt.EventQueue$4.run(EventQueue.java:717)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:716)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:159)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)