Geckolib Item RenderUtils Error

<sorry for grammar mistakes>

Hello! I made some guns for my mod using Nerdy's Geckolib Plugin! It worked just fine when this error seemingly popped out of nowhere...

Here's the error:

part 1: https://imgur.com/a/wffHrYi

part 2: https://imgur.com/a/FgFR0VA

I'm using MCreator 2024.1 (i just switched to 2024.2 but the error appeared when i was still on 2024.1) 

If anyone have an idea on how to solve this issue, they're welcome.