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java.lang.NullPointerException: 	at org.pentaho.di.trans.steps.mapping.MappingMeta.loadMappingMeta(MappingMeta.java:620)	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.getStepFields(TransMeta.java:1730)	at org.pentaho.di.trans.TransMeta.getStepFields(TransMeta.java:1675)	at org.pentaho.di.trans.TransMeta.getStepFields(TransMeta.java:1650)	at org.pentaho.di.trans.steps.mapping.MappingMeta.getFields(MappingMeta.java:552)	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.getStepFields(TransMeta.java:1675)	at org.pentaho.di.trans.TransMeta.getStepFields(TransMeta.java:1650)	at org.pentaho.di.ui.trans.debug.TransDebugDialog.showStepDebugInformation(TransDebugDialog.java:373)	at org.pentaho.di.ui.trans.debug.TransDebugDialog.refreshStepList(TransDebugDialog.java:251)	at org.pentaho.di.ui.trans.debug.TransDebugDialog.getData(TransDebugDialog.java:210)	at org.pentaho.di.ui.trans.debug.TransDebugDialog.open(TransDebugDialog.java:187)	at org.pentaho.di.ui.spoon.delegates.SpoonTransformationDelegate.executeTransformation(SpoonTransformationDelegate.java:833)	at org.pentaho.di.ui.spoon.Spoon$32$1.run(Spoon.java:7512)	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.spoon.Spoon.readAndDispatch(Spoon.java:1169)	at org.pentaho.di.ui.spoon.Spoon.start(Spoon.java:6940)	at org.pentaho.di.ui.spoon.Spoon.main(Spoon.java:553)	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:134)