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java.lang.NullPointerException: 	at org.pentaho.di.ui.spoon.delegates.SpoonJobDelegate.addJobGraph(SpoonJobDelegate.java:977)	at org.pentaho.di.ui.spoon.JobFileListener.open(JobFileListener.java:42)	at org.pentaho.di.ui.spoon.Spoon.openFile(Spoon.java:3747)	at org.pentaho.di.ui.spoon.Spoon.openFile(Spoon.java:3448)	at org.pentaho.di.ui.spoon.Spoon.openFile(Spoon.java:3403)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at org.pentaho.ui.xul.impl.AbstractXulDomContainer.invoke(AbstractXulDomContainer.java:329)	at org.pentaho.ui.xul.impl.AbstractXulComponent.invoke(AbstractXulComponent.java:135)	at org.pentaho.ui.xul.impl.AbstractXulComponent.invoke(AbstractXulComponent.java:123)	at org.pentaho.ui.xul.swt.tags.SwtToolbarbutton.access$100(SwtToolbarbutton.java:36)	at org.pentaho.ui.xul.swt.tags.SwtToolbarbutton$1.widgetSelected(SwtToolbarbutton.java:83)	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:1157)	at org.pentaho.di.ui.spoon.Spoon.start(Spoon.java:6658)	at org.pentaho.di.ui.spoon.Spoon.main(Spoon.java:545)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at org.pentaho.commons.launcher.Launcher.main(Launcher.java:110)