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Run the latest version 262 on MS Partner VM Machine. (Moved the editor to root directory to avoid log path error).
Load the contoso organizations , after getting the element list , I clicked on each one of them to see what the have.
Some of them (Process , Currency , E-Mail Template, Queue,Contract Template ) had error :
An error occured: System.NullReferenceException: Object reference not set to an instance of an object.
at RibbonEditor.RibbonDiffXml.BuildTreeViewElement(TreeNode parentNode)