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

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java.lang.NullPointerException:
at org.pentaho.di.trans.steps.excelwriter.ExcelWriterStep.processRow(ExcelWriterStep.java:92)
at org.pentaho.di.trans.step.RunThread.run(RunThread.java:62)
at java.lang.Thread.run(Thread.java:745)

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