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java.lang.NullPointerException: 	at org.eclipse.jface.viewers.CustomHashtable.hashCode(CustomHashtable.java:265)	at org.eclipse.jface.viewers.CustomHashtable.get(CustomHashtable.java:237)	at org.eclipse.jface.viewers.StructuredViewer.mapElement(StructuredViewer.java:1228)	at org.eclipse.jface.viewers.TreeViewer.mapElement(TreeViewer.java:994)	at org.eclipse.jface.viewers.StructuredViewer.associate(StructuredViewer.java:602)	at org.eclipse.jface.viewers.AbstractTreeViewer.associate(AbstractTreeViewer.java:653)	at org.eclipse.jface.viewers.AbstractTreeViewer.doUpdateItem(AbstractTreeViewer.java:838)