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java.lang.NullPointerException at java.util.Hashtable.hash(Unknown Source) at java.util.Hashtable.get(Unknown Source) at org.pentaho.di.trans.steps.denormaliser.Denormaliser.processFirstRow(Denormaliser.java:177) at org.pentaho.di.trans.steps.denormaliser.Denormaliser.processRow(Denormaliser.java:91) at org.pentaho.di.trans.step.RunThread.run(RunThread.java:62) at java.lang.Thread.run(Unknown Source)