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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)