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Failed to execute runnable (java.lang.NullPointerException)
java.lang.NullPointerException: 	at org.pentaho.di.trans.steps.mapping.MappingMeta.getFields(MappingMeta.java:356)	at org.pentaho.di.trans.TransMeta.getThisStepFields(TransMeta.java:1708)	at org.pentaho.di.trans.TransMeta.getStepFields(TransMeta.java:1563)	at org.pentaho.di.trans.TransMeta.getPrevStepFields(TransMeta.java:1611)	at org.pentaho.di.trans.TransMeta.getPrevStepFields(TransMeta.java:1585)	at org.pentaho.di.trans.TransMeta.getPrevStepFields(TransMeta.java:1574)	at org.pentaho.di.ui.trans.steps.selectvalues.SelectValuesDialog$8.run(SelectValuesDialog.java:472)	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 org.pentaho.di.ui.trans.steps.selectvalues.SelectValuesDialog.open(SelectValuesDialog.java:463)	at org.pentaho.di.ui.spoon.delegates.SpoonStepsDelegate.editStep(SpoonStepsDelegate.java:124)	at org.pentaho.di.ui.spoon.Spoon.editStep(Spoon.java:6420)	at org.pentaho.di.ui.spoon.trans.TransGraph.editStep(TransGraph.java:2153)	at org.pentaho.di.ui.spoon.trans.TransGraph.access$100(TransGraph.java:116)	at org.pentaho.di.ui.spoon.trans.TransGraph$4.mouseDoubleClick(TransGraph.java:312)	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.repository.dialog.RepositoryExplorerDialog.open(RepositoryExplorerDialog.java:583)	at org.pentaho.di.ui.spoon.Spoon.exploreRepository(Spoon.java:2898)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at org.pentaho.xul.EventHandler.handleMenuEvent(EventHandler.java:42)	at org.pentaho.xul.swt.menu.MenuBar.handleMenuEvent(MenuBar.java:52)	at org.pentaho.xul.swt.menu.Menu.handleMenuEvent(Menu.java:117)	at org.pentaho.xul.swt.menu.MenuChoice.handleMenuEvent(MenuChoice.java:77)	at org.pentaho.xul.swt.menu.MenuChoice.handleEvent(MenuChoice.java:73)	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:873)	at org.pentaho.di.ui.spoon.Spoon.start(Spoon.java:5626)	at org.pentaho.di.ui.spoon.Spoon.run(Spoon.java:5722)	at org.pentaho.di.ui.spoon.Spoon.main(Spoon.java:371)