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This exception has no message.
java.util.ConcurrentModificationException: 	at java.util.Hashtable$Enumerator.next(Unknown Source)	at org.pentaho.di.ui.spoon.delegates.SpoonTransformationDelegate.closeTransformation(SpoonTransformationDelegate.java:164)	at org.pentaho.di.ui.spoon.delegates.SpoonTabsDelegate.tabClose(SpoonTabsDelegate.java:95)	at org.pentaho.di.ui.spoon.Spoon.tabClose(Spoon.java:2852)	at org.pentaho.xul.swt.tab.TabSet.notifyCloseListeners(TabSet.java:128)	at org.pentaho.xul.swt.tab.TabSet.close(TabSet.java:68)	at org.eclipse.swt.custom.CTabFolder.onMouse(Unknown Source)	at org.eclipse.swt.custom.CTabFolder$1.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.eclipse.swt.widgets.Display.readAndDispatch(Unknown Source)	at org.pentaho.di.ui.spoon.Spoon.readAndDispatch(Spoon.java:1006)	at org.pentaho.di.ui.spoon.Spoon.start(Spoon.java:6206)	at org.pentaho.di.ui.spoon.Spoon.main(Spoon.java:426)