Dear Vardan,
the error message seems to suggest that there might be some string values with non-standard characters which MATLAB refuses to save to the .mat file (e.g. condition/parameter/factor names or file/pathnames). If you can not fix the problem by avoiding these characters, you may want to try newer MATLAB versions. Over the years, MATLAB has continually improved support for non-english character encodings, and newer versions are usually better internationalised than older ones.
Best regards
Volkmar
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