java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at org.pentaho.di.trans.steps.delete.Delete.dispose(Delete.java:261)
at org.pentaho.di.trans.Trans.prepareExecution(Trans.java:714)
at org.pentaho.di.ui.spoon.trans.TransGraph$22.run(TransGraph.java:3639)
at java.lang.Thread.run(Thread.java:662)

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