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java.lang.NullPointerException: 	at org.eclipse.swt.widgets.Shell.setEnabled(Unknown Source)	at chrriis.dj.nativeswing.swtimpl.core.SWTNativeComponent$CMN_setShellEnabled.run(SWTNativeComponent.java:1144)	at chrriis.dj.nativeswing.swtimpl.CommandMessage.runCommand(CommandMessage.java:61)	at chrriis.dj.nativeswing.swtimpl.core.ControlCommandMessage.runCommand(ControlCommandMessage.java:166)	at chrriis.dj.nativeswing.swtimpl.NativeInterface.runMessageCommand(NativeInterface.java:168)	at chrriis.dj.nativeswing.swtimpl.core.SWTNativeInterface.runMessageCommand(SWTNativeInterface.java:1324)	at chrriis.dj.nativeswing.swtimpl.core.MessagingInterface.runMessage(MessagingInterface.java:121)	at chrriis.dj.nativeswing.swtimpl.core.MessagingInterface.processReceivedMessages(MessagingInterface.java:106)	at chrriis.dj.nativeswing.swtimpl.core.MessagingInterface.access$2(MessagingInterface.java:94)	at chrriis.dj.nativeswing.swtimpl.core.MessagingInterface$2$2.run(MessagingInterface.java:438)	at org.eclipse.swt.widgets.RunnableLock.run(Unknown Source)	at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Unknown Source)	at org.eclipse.swt.widgets.Display.runAsyncMessages(Unknown Source)	at org.eclipse.swt.widgets.Display.readAndDispatch(Unknown Source)	at chrriis.dj.nativeswing.swtimpl.core.SWTNativeInterface$InProcess.runSWTEventPump(SWTNativeInterface.java:669)	at chrriis.dj.nativeswing.swtimpl.core.SWTNativeInterface$InProcess.runEventPump(SWTNativeInterface.java:661)	at chrriis.dj.nativeswing.swtimpl.core.SWTNativeInterface.runEventPump_(SWTNativeInterface.java:475)	at chrriis.dj.nativeswing.swtimpl.NativeInterface.runEventPump(NativeInterface.java:124)	at chrriis.dj.nativeswing.swtimpl.demo.DemoFrame.main(DemoFrame.java:55)