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java.lang.NullPointerException: 	at org.pentaho.reporting.designer.core.editor.styles.StyleTableModel.findFirstOccuranceOfHeaderTitle(StyleTableModel.java:393)	at org.pentaho.reporting.designer.core.editor.styles.StyleTableModel.reconcileState(StyleTableModel.java:380)	at org.pentaho.reporting.designer.core.editor.styles.StyleTableModel.updateData(StyleTableModel.java:359)	at org.pentaho.reporting.designer.core.editor.styles.StyleTableModel$UpdateDataTask.run(StyleTableModel.java:241)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:417)	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:269)	at java.util.concurrent.FutureTask.run(FutureTask.java:123)	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:651)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:676)	at java.lang.Thread.run(Thread.java:595)