Me and my friend downloaded the modpack from the curseforge client, its all good for me, but for him, that crash happens

Have you tried the classic "turn it off and on again"? Just redownload the pack. My first guess is that some EnderIO file did not download correctly.

Yes, it also happened to have duped ender IO files, removed it and still the same error

Delete and redownload the whole pack. Multiple things may have corrupted.

taiga is not in this pack, so it must have been a corruption in download. presumed resolved.