It's kind of self explanatory: the game is crashing on startup.
I don't know if it's just a compatibility thing or not so I will include what mods I'm using.

Error message:
The game crashed whilst initializing game Error: java.lang.RuntimeException: Could not execute entrypoint stage 'client' due to errors, provided by 'colormatic'! Exit Code: -1

I'm using these mods:

Crash report:
crash-2021-08-28_21.03.27-client.txt

Edit: It's definitely not a compatibility issue, removed all other mods except fabric api and modmenu and the game was still crashing.

im not the one!

same for me!

its working for me it doesn't crash i my case

the same is happening to me, same error message too!

Colormatic no longer bundles Cloth Config. You must use ClothConfig alongside Colormatic in order for it to work.