Quiz not opening in files converted from Studio 09 to studio 13

I am converting 50 files from Studio 9 to Studio 13.  Each of my files contain quizmaker quizzes.  I am facing some problems when opening quizmaker quizzes after conversion into the latest version of Studio 13.  It gives me a weird error message saying the following

Unable to open Quiz {quiz name} for editing.

If this quiz is already open in Articulate Engage then please close it and then retry.

This error message makes absolutely no sense to me.  Is this a bug or a known issue.  Can you please help.  Such error messages throw a wrench in the whole production process.

Looking forward to your response.



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