Minecraft 1.16.5 Forge error with data packages?

Hi, I have put together a modpack and in 1.16.5 Forge I can no longer create worlds because here comes the error "Errors in the currently selected data packages prevented the world from loading." It has never happened to me in Minecraft must be new…

So I checked and it affects the mods Citadel, geckolib. Patchouli and Ice and Fire. (Problem: Mod is for an older version of minecraft) The problem is that these mods are needed to use all mods. I have now tried everything: change of version, change of mod version…

Everything is now up to date everywhere but it still doesn't work even though I've played with you before, why doesn't it work anymore?

Well, there's a new version, because old files do not work and just because the name is 1.16.5 it still can't work