Incompatible mods found!
net.fabricmc.loader.impl.FormattedException: Some of your mods are incompatible with the game or each other!
A potential solution has been determined, this may resolve your problem:
- Replace mod 'fullbright_1.21' (fullbright_1_21) 1.0-SNAPSHOT with any version that is compatible with:
- fabricloader 0.16.7
- minecraft 1.21.1
More details:
- Mod 'fullbright_1.21' (fullbright_1_21) 1.0-SNAPSHOT requires version 0.16.8 or later of mod 'Fabric Loader' (fabricloader), but only the wrong version is present: 0.16.7!
- Mod 'fullbright_1.21' (fullbright_1_21) 1.0-SNAPSHOT requires version 1.21 of 'Minecraft' (minecraft), but only the wrong version is present: 1.21.1!
- Mod 'Concurrent Chunk Management Engine (Optimizations/Natives Math)' (c2me-opts-natives-math) 0.3.0+alpha.0.293+1.21.1 requires version 22 or later of 'OpenJDK 64-Bit Server VM' (java), but only the wrong version is present: 21!
at net.fabricmc.loader.impl.FormattedException.ofLocalized(FormattedException.java:51)
at net.fabricmc.loader.impl.FabricLoaderImpl.load(FabricLoaderImpl.java:196)
at net.fabricmc.loader.impl.launch.knot.Knot.init(Knot.java:146)
at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:68)
at net.fabricmc.loader.impl.launch.knot.KnotClient.main(KnotClient.java:23)

This is the error.

I was trying to uninstall everything that is related to mod GammaUtills (Fullbright) and it still shows this.

I have fabric loader 0.16.8 and minecraft 1.21.1.

I think i tried most things that everyone would try.

If yall have suggestions, I am open to hear them :D.

The fullbright mod you have is not Gamma Utils, it seems to be another mod.
You can get Gamma Utils for 1.21.1 from here: https://modrinth.com/mod/gamma-utils/version/2.1.1