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java.util.EmptyStackException: 	at org.pentaho.reporting.libraries.base.util.FastStack.peek(FastStack.java:124)	at org.pentaho.reporting.engine.classic.core.states.crosstab.CrosstabProcessorFunction.itemsAdvanced(CrosstabProcessorFunction.java:284)	at org.pentaho.reporting.engine.classic.core.states.SubLayoutProcess.fireItemsAdvancedEvent(SubLayoutProcess.java:270)	at org.pentaho.reporting.engine.classic.core.states.SubLayoutProcess.fireReportEvent(SubLayoutProcess.java:207)	at org.pentaho.reporting.engine.classic.core.states.process.ProcessState.fireReportEvent(ProcessState.java:998)	at org.pentaho.reporting.engine.classic.core.states.process.ProcessDetailsHandler.advance(ProcessDetailsHandler.java:46)	at org.pentaho.reporting.engine.classic.core.states.process.ProcessState.advance(ProcessState.java:815)	at org.pentaho.reporting.engine.classic.core.layout.output.AbstractReportProcessor.processPrepareLevels(AbstractReportProcessor.java:346)	at org.pentaho.reporting.engine.classic.core.layout.output.AbstractReportProcessor.performStructuralPreprocessing(AbstractReportProcessor.java:498)	at org.pentaho.reporting.engine.classic.core.layout.output.AbstractReportProcessor.prepareReportProcessing(AbstractReportProcessor.java:412)	at org.pentaho.reporting.engine.classic.core.modules.output.pageable.graphics.PrintReportProcessor.getNumberOfPages(PrintReportProcessor.java:77)	at org.pentaho.reporting.engine.classic.core.modules.gui.base.PreviewPane$RepaginationRunnable.run(PreviewPane.java:266)	at org.pentaho.reporting.engine.classic.core.util.Worker.run(Worker.java:174)