The reason behind this issue is your Normal.dotm. Normal.dotm is a template which is used as the basis of creating new blank documents. If you are seeing this message then the most likely scenario is that the Normal.dotm is corrupted.
Method 1: Deleted Normal.dotm
Since the most likely cause of the error is corrupt Normal.dotm, deleting the corrupted file resolves the issue. Microsoft Office 2016 looks for this specific file every time you open the Microsoft Office. If the Microsoft Office can’t find the Normal.dotm file then it creates a new one automatically. So, simply delete the corrupt file and it will automatically be recreated the next time you start Microsoft Office. Follow the steps given below to delete Normal.dotm file Note: If you find multiple normal.dotm files or a ~normal.dotm file then delete those too. Now simply open the Microsoft Office and everything should be fine. Note: If you can’t find the normal.dotm file at the location given in step 2 then enter the location ~/Library/Group Containers/UBF8T346G9.Office/User Content/Templates in step 2 and look for the normal.dotm file in there.
Method 2: Update Microsoft Office
Make sure you download and install the latest updates by Microsoft Office. The latest updates have resolved the issues for a lot of users. Here are the steps for updating your Microsoft Office
Once the Office is updated, you should be good to go. Note: If you have Zotero, a citation program, then update Zotero as well.
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