Minecraft not starting

I try to open Minecraft by pressing the Run Client button, but for some reason, when the loading Minecraft screen almost gets done loading, it closes. I tried making a new workspace with the same mob models and items, but then my Minecraft sill doesn't open. Then I try looking at other user's posts, but I tried deleting the run and build folders. But that didn't work too! Also, I pressed every single button. Rebuild, Debug, and all the others. I have linked my crash report. PLEASE give an answer because I NEED TO HAVE THIS MOD INTACT.

Mcreator crash report - Pastebin.com