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java.lang.NullPointerException at org.pentaho.di.trans.steps.excelinput.ExcelInput.fillRow(ExcelInput.java:189) at org.pentaho.di.trans.steps.excelinput.ExcelInput.getRowFromWorkbooks(ExcelInput.java:663) at org.pentaho.di.trans.steps.excelinput.ExcelInput.processRow(ExcelInput.java:469) at org.pentaho.di.trans.step.RunThread.run(RunThread.java:50) at java.lang.Thread.run(Unknown Source)