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org.eclipse.swt.SWTException: Widget is disposed	at org.eclipse.swt.SWT.error(SWT.java:4361)	at org.eclipse.swt.SWT.error(SWT.java:4276)	at org.eclipse.swt.SWT.error(SWT.java:4247)	at org.eclipse.swt.widgets.Widget.error(Widget.java:480)	at org.eclipse.swt.widgets.Widget.checkWidget(Widget.java:417)	at org.eclipse.swt.widgets.Widget.getData(Widget.java:506)	at org.eclipse.jface.viewers.AbstractTreeViewer.getTreePathFromItem(AbstractTreeViewer.java:2933)	at org.eclipse.jface.viewers.AbstractTreeViewer.internalGetWidgetToSelect(AbstractTreeViewer.java:1740)	at org.eclipse.jface.viewers.AbstractTreeViewer.internalExpand(AbstractTreeViewer.java:1635)	at org.eclipse.jface.viewers.AbstractTreeViewer.setSelectionToWidget(AbstractTreeViewer.java:2530)	at org.eclipse.ui.navigator.CommonViewer.setSelectionToWidget(CommonViewer.java:446)	at org.eclipse.jface.viewers.AbstractTreeViewer.setSelectionToWidget(AbstractTreeViewer.java:2967)	at org.eclipse.jface.viewers.StructuredViewer.preservingSelection(StructuredViewer.java:1450)	at org.eclipse.jface.viewers.TreeViewer.preservingSelection(TreeViewer.java:403)	at org.eclipse.jface.viewers.StructuredViewer.preservingSelection(StructuredViewer.java:1404)	at org.eclipse.jface.viewers.StructuredViewer.refresh(StructuredViewer.java:1533)	at org.eclipse.jface.viewers.ColumnViewer.refresh(ColumnViewer.java:548)	at org.eclipse.ui.navigator.CommonViewer.refresh(CommonViewer.java:353)	at org.eclipse.ui.navigator.CommonViewer.refresh(CommonViewer.java:510)	at org.eclipse.jface.viewers.StructuredViewer.refresh(StructuredViewer.java:1465)	at de.tobject.findbugs.view.explorer.RefreshJob$1.run(RefreshJob.java:100)	at org.eclipse.ui.internal.UILockListener.doPendingWork(UILockListener.java:164)	at org.eclipse.ui.internal.UISynchronizer$3.run(UISynchronizer.java:158)	at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)	at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:135)