So i tried to add entity culling mod in Fabric 1.21.6 and the game won't start.

Here's the crash log:

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:
- Install fabric-api, any version.
More details:
- Mod 'EntityCulling' (entityculling) 1.8.0 requires any version of fabric-api, which is missing!
- Mod 'TRansition' (transition) 1.0.2 requires any version of fabric-api, which is missing!
- Mod 'TRender' (trender) 1.0.4 requires any version of fabric-api, which is missing!
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)

Btw my other mods are Iris and Sodium.

Please HEEELLLLLPPP 😭😭😭

Fabric Loader have told you Install fabric-api.

Correct. You are missing the https://modrinth.com/mod/fabric-api