I used to have mixinbooter 3.0 and mixincompat 0.7-0.8 installed. As I read in changelog, the second one is no longer needed. I deleted it and updated mixinbooter to 3.2, but I get the same error.

crash-2022-01-21_09.49.50-client.txt

It also Incompatible with MixinBootstrap ,you need delete this mod.

What about https://www.curseforge.com/minecraft/mc-mods/mixin-booter/files/3614763?

it works for me.

What about https://www.curseforge.com/minecraft/mc-mods/mixin-booter/files/3614763?

I deleted MixinBootstrap as they said above, and installed the thin version and everything worked, thanks.

I'll try fix this the proper way by dealing with other mods.

Something I want to add
If the newest update is downloaded trough the curse client it’ll append the . Infront of the file name.

when it’s downloaded directly from the website it actually won’t have a . Infront of it.

I suggest to maybe. Use a different letter like ! Perhaps?
.filename.ext is also used to make files hidden in Linux.

I noticed that the . Is also important so that the mod is loaded as the first one?