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java.lang.NullPointerException: 	at org.datacleaner.components.group.GrouperTransformer.getOutputDataStreams(GrouperTransformer.java:167)	at org.datacleaner.job.builder.AbstractComponentBuilder.getOutputDataStreams(AbstractComponentBuilder.java:940)	at org.datacleaner.widgets.visualization.JobGraphNodeBuilder.addNodes(JobGraphNodeBuilder.java:322)	at org.datacleaner.widgets.visualization.JobGraphNodeBuilder.buildGraphInternal(JobGraphNodeBuilder.java:106)	at org.datacleaner.widgets.visualization.JobGraphNodeBuilder.buildGraphInternal(JobGraphNodeBuilder.java:86)	at org.datacleaner.widgets.visualization.JobGraphNodeBuilder.buildGraph(JobGraphNodeBuilder.java:79)	at org.datacleaner.widgets.visualization.JobGraph.refresh(JobGraph.java:148)	at org.datacleaner.windows.AnalysisJobBuilderWindowImpl$WindowTransformerChangeListener.onConfigurationChanged(AnalysisJobBuilderWindowImpl.java:207)	at org.datacleaner.windows.AnalysisJobBuilderWindowImpl$WindowTransformerChangeListener.onConfigurationChanged(AnalysisJobBuilderWindowImpl.java:179)	at org.datacleaner.job.builder.TransformerComponentBuilder.onConfigurationChanged(TransformerComponentBuilder.java:295)	at org.datacleaner.job.builder.AbstractComponentBuilder.setConfiguredProperty(AbstractComponentBuilder.java:331)	at org.datacleaner.widgets.properties.MinimalPropertyWidget.fireValueChanged(MinimalPropertyWidget.java:144)	at org.datacleaner.widgets.properties.MinimalPropertyWidget.fireValueChanged(MinimalPropertyWidget.java:73)	at org.datacleaner.widgets.properties.MultipleInputColumnsPropertyWidget$1.onItemSelected(MultipleInputColumnsPropertyWidget.java:89)	at org.datacleaner.widgets.properties.MultipleInputColumnsPropertyWidget$1.onItemSelected(MultipleInputColumnsPropertyWidget.java:83)	at org.datacleaner.widgets.DCCheckBox.notifyListeners(DCCheckBox.java:151)	at org.datacleaner.widgets.DCCheckBox.notifyListeners(DCCheckBox.java:145)	at org.datacleaner.widgets.DCCheckBox.itemStateChanged(DCCheckBox.java:80)	at javax.swing.AbstractButton.fireItemStateChanged(AbstractButton.java:2050)	at javax.swing.AbstractButton$Handler.itemStateChanged(AbstractButton.java:2355)	at javax.swing.DefaultButtonModel.fireItemStateChanged(DefaultButtonModel.java:455)	at javax.swing.JToggleButton$ToggleButtonModel.setSelected(JToggleButton.java:272)	at javax.swing.JToggleButton$ToggleButtonModel.setPressed(JToggleButton.java:289)	at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)	at com.jgoodies.looks.plastic.ActiveBasicButtonListener.mouseReleased(ActiveBasicButtonListener.java:69)	at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:289)	at java.awt.Component.processMouseEvent(Component.java:6533)	at javax.swing.JComponent.processMouseEvent(JComponent.java:3324)	at java.awt.Component.processEvent(Component.java:6298)	at java.awt.Container.processEvent(Container.java:2236)	at java.awt.Component.dispatchEventImpl(Component.java:4889)	at java.awt.Container.dispatchEventImpl(Container.java:2294)	at java.awt.Component.dispatchEvent(Component.java:4711)	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4888)	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4525)	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4466)	at java.awt.Container.dispatchEventImpl(Container.java:2280)	at java.awt.Window.dispatchEventImpl(Window.java:2746)	at java.awt.Component.dispatchEvent(Component.java:4711)	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)	at java.awt.EventQueue.access$500(EventQueue.java:97)	at java.awt.EventQueue$3.run(EventQueue.java:709)	at java.awt.EventQueue$3.run(EventQueue.java:703)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)	at java.awt.EventQueue$4.run(EventQueue.java:731)	at java.awt.EventQueue$4.run(EventQueue.java:729)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)