"The shared-script-properties property is deprecated and will be removed in the future. Use the user-data property instead."

[pitsi]

The message in the title is what pops up at the very first line of mpv when playing any file or stream and it is due to a change in mpv 0.37. Unfortunately, I do not have the knowledge to fix it, but some other (forks of) osc scripts have already done it, e.g.

https://github.com/zydezu/ModernX/commit/8819a61618048b89bb1fc20b39458f371ea6e62a