I would recommend testing with a new blank document. If the issue is document specific, please have a look at this article:
https://support.clarivate.com/Endnote/s/article/EndNote-Mac-COM-exception-error
I would recommend testing with a new blank document. If the issue is document specific, please have a look at this article:
https://support.clarivate.com/Endnote/s/article/EndNote-Mac-COM-exception-error