Custom biome crashes the game when I try to load a world

So basically I'm trying to make a custom forest biome that generates in the overworld for my mod but when I try to load a world, the games crashes (I can launch minecraft normally and nothing happens in the menu its only when I try to load an exixting world or create a new one). 

custom biome crashes game (console) - mcreator - Pastebin.com

note : I am currently using mcreator 2025.2/neoforge 1.21.1

plz answer as quick as you can 

thankks