java.lang.reflect.InvocationTargetException: This exception has no message.

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java.lang.NullPointerException:
at org.pentaho.di.ui.spoon.delegates.SpoonSlaveDelegate.newSlaveServer(SpoonSlaveDelegate.java:82)
at org.pentaho.di.ui.spoon.Spoon.newSlaveServer(Spoon.java:6343)
at org.pentaho.di.ui.spoon.Spoon.newSlaveServer(Spoon.java:2053)
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:585)
at org.pentaho.ui.xul.impl.AbstractXulDomContainer.invoke(AbstractXulDomContainer.java:317)
at org.pentaho.ui.xul.impl.AbstractXulComponent.invoke(AbstractXulComponent.java:131)
at org.pentaho.ui.xul.impl.AbstractXulComponent.invoke(AbstractXulComponent.java:119)
at org.pentaho.ui.xul.swt.tags.SwtMenuitem.access$100(SwtMenuitem.java:24)
at org.pentaho.ui.xul.swt.tags.SwtMenuitem$1.widgetSelected(SwtMenuitem.java:74)
at org.eclipse.swt.widgets.TypedListener.handleEvent(Unknown Source)
at org.eclipse.swt.widgets.EventTable.sendEvent(Unknown Source)
at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Unknown Source)
at org.pentaho.di.ui.spoon.Spoon.readAndDispatch(Spoon.java:1038)
at org.pentaho.di.ui.spoon.Spoon.start(Spoon.java:5888)
at org.pentaho.di.ui.spoon.Spoon.main(Spoon.java:474)
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:585)
at org.pentaho.commons.launcher.Launcher.main(Launcher.java:110)

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