If the screenshot comes from a ported MV project, then you have not done the port correctly.
As I said, your screenshot talks about scripts named rpg_managers.js, rpg_core.js and rpg_sprites.js - these are all MV scripts and should not have been ported, but it looks like you did.
The MZ scripts all have names like rmmz_managers.js, rmmz_core.js and rmmz_sprites.js
It makes sense then that it's crashing on animations, because animations changed completely between MV and MZ.
You should start over and do your port again into a new MZ project. This time be very careful about what you copy over. You should not copy over anything in the main project folder (index.html, package.json) and you should not copy over the js folder or anything in it.
The second draft of my script is almost done, and I don't think I'm going to write a third draft. I'll make changes to dialogue here and there, but I'm happy with the series of events the way they are.
Just found an obviously custom effect (i.e. edited by me) in my resources>sounds folder called "rip jaw off". Dear Lord what is wrong with me as a person that at some point I needed a sound *specifically* for THAT??