Minecraft crashes when I use the mod after exporting

Hello, this is my first time creating a forum so please tell me if I'm doing something wrong.

My brother and I made some new blocks with MCreator but after exporting it, my minecraft crashes. His MC is doing fine tho.

I also tried to read previous discussions but can't find the solution. I have removed all other mods and tried to increase the RAM from 4k to 4.5k (cause I once read a comment about that) and here is the screenshot and a crash-report log will be at the comments \cause i dunno how to post the logs.

I hope someone can help me. Thank you.