Hi,
For the error message, it seems to say there's a problem to list what's inside a particular directory (may it's empty ?)
Anyway MMS is not designed to look for missing TV shows files in library.
I don't really know python scripting (just a bit PHP) but I try to modify MMS extension to get working with TV Shows episodes.
After some test, I found something which seems to be functional.
http://photonoxx.free.fr/forum/plugin.video.mtvs.zip
you have to install this addons with install from zip functionality (do this at your own risk, even if it should not be risky)
What I do :
I quickly modify addons name (in addons.xml) and file name, so you can use beside MMS.
I change scan_movie_source function (in default.py) method to get info, from videolibrary.getmovies to videolibrary.getepisodes, I remove the catching about trailer info in Videolibrary.getEpisodes (trailer info doesn't exists for tvshows) and comment part of the script related to Movies trailer.
After some test, it seems to work, initially, MMS found 1993 files over more 4000 files and 1993 files was missing.
Now I get only 90 missing files (all seems to met with really not recognized files (merged episodes and other things)).
Since MMS only work for movies, MTVS (missing TV scanner) should only work with tv shows sources (do more is beyond my competences... sorry).
I probably can't do more, but if it works for you too, I would appreciate to know it
(and sorry for my poor and awful english)