I don't know how I can start the game. The game crashes with the forbbiden and arcanus mod and it appears this:
The game crashed whilst initializing game
Error: java.lang.NoClassDefFoundError: net/valhelsia/valhelsia_core/core/registry/RegistryManager$Builder

Do you have Valhelsia Core installed? That mod is a required dependency for Forbidden & Arcanus.
https://www.curseforge.com/minecraft/mc-mods/valhelsia-core

Optifine is incompatble?I will try to update the Optifine version. This is all the crash text I don't know why don't show more details.
thanks for your attention.

yes I have it, when I put it and I try to open minecraft it appears this:
The game crashed whilst initializing game
Error: org.spongepowered.asm.mixin.transformer.throwables.MixinTransformerError: An unexpected critical error was encountered

You probably have Optifine installed which is incompatible. If not please provide more context (upload the full crash log).

It doesn't works with Optifine UHD 7

Yeah it's known and we cannot really fix it since Optifine is closed source which means we can't see how it changes the stuff we need

Oh ok, thanks for your atention.