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org.eclipse.swt.SWTException: Widget is disposed	at org.eclipse.swt.SWT.error(SWT.java:3374)	at org.eclipse.swt.SWT.error(SWT.java:3297)	at org.eclipse.swt.SWT.error(SWT.java:3268)	at org.eclipse.swt.widgets.Widget.error(Widget.java:435)	at org.eclipse.swt.widgets.Widget.checkWidget(Widget.java:330)	at org.eclipse.swt.widgets.TreeItem.getItems(TreeItem.java:757)	at org.eclipse.jface.viewers.TreeViewer.getChildren(TreeViewer.java:385)	at org.eclipse.jface.viewers.AbstractTreeViewer.internalFindChild(AbstractTreeViewer.java:1525)	at org.eclipse.jface.viewers.AbstractTreeViewer.internalExpand(AbstractTreeViewer.java:1382)	at org.eclipse.jface.viewers.AbstractTreeViewer.internalExpand(AbstractTreeViewer.java:1377)	at org.eclipse.jface.viewers.AbstractTreeViewer.internalExpand(AbstractTreeViewer.java:1377)	at org.eclipse.jface.viewers.AbstractTreeViewer.internalExpand(AbstractTreeViewer.java:1377)	at org.eclipse.jface.viewers.AbstractTreeViewer.setSelectionToWidget(AbstractTreeViewer.java:2230)	at org.eclipse.ui.navigator.CommonViewer.setSelectionToWidget(CommonViewer.java:337)	at org.eclipse.jface.viewers.AbstractTreeViewer.setSelectionToWidget(AbstractTreeViewer.java:2594)	at org.eclipse.jface.viewers.StructuredViewer.preservingSelection(StructuredViewer.java:1330)	at org.eclipse.jface.viewers.StructuredViewer.refresh(StructuredViewer.java:1413)	at org.eclipse.ui.navigator.CommonViewer.refresh(CommonViewer.java:303)	at org.eclipse.ui.navigator.CommonViewer.refresh(CommonViewer.java:401)	at org.eclipse.jface.viewers.StructuredViewer.refresh(StructuredViewer.java:1345)