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java.lang.NullPointerException: 	at mondrian.rolap.RolapStar$Column.generateExprString(RolapStar.java:1168)	at mondrian.rolap.RolapStar.generateSql(RolapStar.java:925)	at org.pentaho.aggdes.model.mondrian.MondrianSchema.generateAggregateSql(MondrianSchema.java:273)	at org.pentaho.aggdes.output.impl.PopulateTableGenerator.generate(PopulateTableGenerator.java:59)	at org.pentaho.aggdes.output.impl.AbstractGenerator.generateFull(AbstractGenerator.java:34)	at org.pentaho.aggdes.output.impl.OutputServiceImpl.getFullArtifact(OutputServiceImpl.java:152)	at org.pentaho.aggdes.ui.form.controller.ExportHandler.showPreview(ExportHandler.java:212)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:592)	at org.pentaho.ui.xul.impl.AbstractXulDomContainer.invoke(AbstractXulDomContainer.java:323)	at org.pentaho.ui.xul.swing.tags.SwingButton$OnClickRunnable.run(SwingButton.java:58)	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:242)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:153)	at java.awt.Dialog$1.run(Dialog.java:535)	at java.awt.Dialog$2.run(Dialog.java:565)	at java.security.AccessController.doPrivileged(Native Method)	at java.awt.Dialog.show(Dialog.java:563)	at java.awt.Component.show(Component.java:1302)	at java.awt.Component.setVisible(Component.java:1255)	at org.pentaho.ui.xul.swing.tags.SwingDialog.show(SwingDialog.java:234)	at org.pentaho.aggdes.ui.form.controller.ExportHandler.openDialog(ExportHandler.java:144)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:592)	at org.pentaho.ui.xul.impl.AbstractXulDomContainer.invoke(AbstractXulDomContainer.java:323)	at org.pentaho.ui.xul.swing.tags.SwingButton$OnClickRunnable.run(SwingButton.java:58)	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:242)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)