java - Changing Label provider of Jface tree viewer giving exceptions in MAC -

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I am facing a significant problem using the cell label provider for the Jefface Tree Viewer in Mac. In windows systems, there is no problem. I have a scenario to dynamically change the label provider, for that I have created a tree viewer before using content provider and label provider (cell label provider). After that I'm trying to change the label provider of the set label provider option to the tree viewer, but I'm having a null pointer exception.

Exception:. Org.eclipse.jface.viewers.StyledCellLabelProvider.measure (StyledCellLabelProvider.java:258) 

  java.lang Org.eclipse.jface.viewers.StyledCellLabelProvider.getViewerCell (StyledCellLabelProvider.java / 30) Hole on org.eclipse.jface.viewers.OwnerDrawLabelProvider Org.eclipse.swt.widgets.Display.sendEvent (Display.java:4188) at $ OwnerDrawListener.handleEvent (OwnerDrawLabelProvider.java:56) org.eclipse.swt.widgets.EventTable.sendEvent (EventTable.java:84) on Org.eclipse.swt.widgets.Widget.sendEvent org.eclipse.swt.widgets.Widget.sendEvent (Widget.java1490) at (Widget.java1467) at org.eclipse.swt.widgets.Widget.sendEvent ( Widget.java:1475) org.eclipse.swt.widgets.TreeItem.calculateWidth (TreeItem.javaajor80) org.eclipse.swt.widgets.Tree.setScrollWidth (at tree.java2972) at org.eclipse.swt at .widget s.TreeItem.setText (TreeItem.java1473) org.eclipse.jface.viewers.TreeViewerRow.setText (TreeViewerRow.java:116) org.eclipse.jface.viewers.ViewerCell.setText in a (ViewerCell.java: 159)


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