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java.lang.NullPointerException: 	at java.lang.System.arraycopy(Native Method)	at org.pentaho.di.trans.steps.transexecutor.TransExecutorMeta.clone(TransExecutorMeta.java:251)	at org.pentaho.di.trans.step.StepMeta.replaceMeta(StepMeta.java:571)	at org.pentaho.di.trans.step.StepMeta.clone(StepMeta.java:562)	at org.pentaho.di.ui.spoon.delegates.SpoonStepsDelegate.editStep(SpoonStepsDelegate.java:120)	at org.pentaho.di.ui.spoon.Spoon.editStep(Spoon.java:8783)	at org.pentaho.di.ui.spoon.trans.TransGraph.editStep(TransGraph.java:3072)	at org.pentaho.di.ui.spoon.trans.TransGraph.mouseDoubleClick(TransGraph.java:755)	at org.eclipse.swt.widgets.TypedListener.handleEvent(Unknown Source)	at org.eclipse.swt.widgets.EventTable.sendEvent(Unknown Source)	at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source)	at org.eclipse.swt.widgets.Display.runDeferredEvents(Unknown Source)	at org.eclipse.swt.widgets.Display.readAndDispatch(Unknown Source)	at org.pentaho.di.ui.spoon.Spoon.readAndDispatch(Spoon.java:1347)	at org.pentaho.di.ui.spoon.Spoon.waitForDispose(Spoon.java:7989)	at org.pentaho.di.ui.spoon.Spoon.start(Spoon.java:9269)	at org.pentaho.di.ui.spoon.Spoon.main(Spoon.java:663)	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:498)	at org.pentaho.commons.launcher.Launcher.main(Launcher.java:92)