Persistent error

I was trying to backport a mod from 1.19.2 to 1.16.5, and while i was doing it, a window pops up saying that there are a few error. My mod has currently only items, and only a few of them had an error, even if everything was made for the same versione. I don't know what to do. 

This is the Workspace ZIP file: https://files.fm/f/kr437kx6r