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java.lang.NullPointerException: 	at org.eclipse.swt.widgets.Composite._getChildren(Unknown Source)	at org.eclipse.swt.widgets.Control.release(Unknown Source)	at org.eclipse.swt.widgets.Widget.dispose(Unknown Source)	at org.eclipse.swt.widgets.Display.release(Unknown Source)	at org.eclipse.swt.graphics.Device.dispose(Unknown Source)	at org.pentaho.di.ui.spoon.Spoon.dispose(Spoon.java:1394)	at org.pentaho.di.ui.spoon.Spoon.waitForDispose(Spoon.java:7968)	at org.pentaho.di.ui.spoon.Spoon.start(Spoon.java:9214)	at org.pentaho.di.ui.spoon.Spoon.main(Spoon.java:653)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:497)	at org.pentaho.commons.launcher.Launcher.main(Launcher.java:92)