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)