java.lang.NullPointerException: null

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java.lang.NullPointerException: null
at org.apache.metamodel.excel.ExcelUpdateCallback.getLastRowNum(ExcelUpdateCallback.java:131)
at org.apache.metamodel.excel.ExcelUpdateCallback.createRow(ExcelUpdateCallback.java:125)
at org.apache.metamodel.excel.ExcelInsertBuilder.execute(ExcelInsertBuilder.java:52)
at org.datacleaner.output.AbstractMetaModelOutputWriter$1.run(AbstractMetaModelOutputWriter.java:94)
at org.apache.metamodel.excel.ExcelDataContext.executeUpdate(ExcelDataContext.java:232)
at org.datacleaner.output.AbstractMetaModelOutputWriter.flushBuffer(AbstractMetaModelOutputWriter.java:85)
at org.datacleaner.output.AbstractMetaModelOutputWriter.close(AbstractMetaModelOutputWriter.java:105)
at org.datacleaner.extension.output.AbstractOutputWriterAnalyzer.getResult(AbstractOutputWriterAnalyzer.java:75)
at org.datacleaner.extension.output.AbstractOutputWriterAnalyzer.getResult(AbstractOutputWriterAnalyzer.java:38)
at org.datacleaner.job.tasks.CollectResultsTask.execute(CollectResultsTask.java:60)
at org.datacleaner.job.concurrent.TaskRunnable.run(TaskRunnable.java:61)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

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