When you set an exported output file to read-only, and try to redo the export after that - trying to overwrite/append the same output file, then Mp3tag shows an error
File: .\mtmainframethreads.cpp
Line: 1025
Version is 2.36
This has been reported before in the German forums and you also mentioned it in one of your posts in the support forums. 
I can confirm.
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