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java.lang.NullPointerException: 	at java.lang.String.compareTo(String.java:1167)	at java.lang.String.compareTo(String.java:92)	at java.util.Arrays.mergeSort(Arrays.java:1144)	at java.util.Arrays.mergeSort(Arrays.java:1155)	at java.util.Arrays.sort(Arrays.java:1079)	at org.pentaho.di.core.parameters.NamedParamsDefault.listParameters(NamedParamsDefault.java:127)	at org.pentaho.di.job.JobMeta.listParameters(JobMeta.java:2650)	at org.pentaho.di.ui.spoon.Spoon.setParametersAsVariablesInUI(Spoon.java:7962)	at org.pentaho.di.ui.spoon.Spoon.setJobMetaVariables(Spoon.java:4154)	at org.pentaho.di.ui.spoon.JobFileListener.open(JobFileListener.java:47)	at org.pentaho.di.ui.spoon.Spoon.openFile(Spoon.java:3976)	at org.pentaho.di.ui.spoon.Spoon.openFile(Spoon.java:3678)	at org.pentaho.di.ui.spoon.Spoon.openFile(Spoon.java:3633)	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:597)	at org.pentaho.ui.xul.impl.AbstractXulDomContainer.invoke(AbstractXulDomContainer.java:329)	at org.pentaho.ui.xul.impl.AbstractXulComponent.invoke(AbstractXulComponent.java:139)	at org.pentaho.ui.xul.impl.AbstractXulComponent.invoke(AbstractXulComponent.java:123)	at org.pentaho.ui.xul.swt.tags.SwtMenuitem.access$100(SwtMenuitem.java:27)	at org.pentaho.ui.xul.swt.tags.SwtMenuitem$1.widgetSelected(SwtMenuitem.java:77)	at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:240)	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)	at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4128)	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1457)	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1480)	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1465)	at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:1270)	at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3974)	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3613)	at org.pentaho.di.ui.spoon.Spoon.readAndDispatch(Spoon.java:1183)	at org.pentaho.di.ui.spoon.Spoon.start(Spoon.java:6968)	at org.pentaho.di.ui.spoon.Spoon.main(Spoon.java:567)