Score cannot be uploaded?

• Sep 17, 2020 - 03:59

I don't know what is inhibiting me from being able to upload a certain arrangement I'm working on. I keep getting this message "The score cannot be uploaded, as we don't support this version of mscz files yet.
Sorry for the inconvenience." Anyone else have this problem?

The score in question:
https://musescore.com/halbig/scores/6346264


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