[Urgent] Cannot read file: bad format

I had written a piece on Musescore, with use of external fonts (the problem source I suppose). After exporting parts to pdf etc. I opened up this piece again only to find the following message:

Cannot read file C:/Users/Acer/Documents/MuseScore2/Scores/Rayuan Coconut Island/Rayuan Coconut Island.mscz:
bad format
XML read error at line 655 column 56: font

How can I access line 655 column 56? I have opened this mcsz file on text editor with no avail.

version MuseScore 2.1.0

Thank you