Biome datapack won't load, Errors in currently selected datapack prevent the world from loading.

I did a biome datapack online and kept switching between versions from 1.19.2 to 1.20.4. It worked everytime when testing it on 1.19.2, but now I'm testing on 1.20.4 and it does not seem to work. Here is the lin to the site I used: https://worldgen.syldium.dev.
Notes: the datapack contains only biome folder, I just wanted to change foliage and water colors for a specific map. Idk what the issue is and can't seem to find it, no logs either as it does not crash nor load