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java.lang.NullPointerException: 	at org.pentaho.di.trans.steps.mapping.MappingMeta.loadMappingMeta(MappingMeta.java:624)	at org.pentaho.di.trans.steps.mapping.MappingMeta.getFields(MappingMeta.java:383)	at org.pentaho.di.trans.TransMeta.getThisStepFields(TransMeta.java:1898)	at org.pentaho.di.trans.TransMeta.getStepFields(TransMeta.java:1753)	at org.pentaho.di.trans.TransMeta.getPrevStepFields(TransMeta.java:1811)	at org.pentaho.di.trans.TransMeta.getPrevStepFields(TransMeta.java:1783)	at org.pentaho.di.trans.TransMeta.getPrevStepFields(TransMeta.java:1771)	at org.pentaho.di.ui.trans.steps.selectvalues.SelectValuesDialog.get(SelectValuesDialog.java:710)	at org.pentaho.di.ui.trans.steps.selectvalues.SelectValuesDialog.access$100(SelectValuesDialog.java:79)	at org.pentaho.di.ui.trans.steps.selectvalues.SelectValuesDialog$2.handleEvent(SelectValuesDialog.java:154)	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:1169)	at org.pentaho.di.ui.spoon.Spoon.start(Spoon.java:6943)	at org.pentaho.di.ui.spoon.Spoon.main(Spoon.java:553)	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.commons.launcher.Launcher.main(Launcher.java:134)