This issue occurs when you try to open a .msg file which is not in your Outlook inbox and stored in an external area i.e. SharePoint or your computer. This issue is a bug in Outlook and it is not a result of using MacroView DMF. At this stage there is no documented solution available.
Please refer to the link below from the Microsoft community where this issue was discussed.
Alternatively, you can contact Microsoft Support on the link below for further assistance.