When starting the game, I get a crash report saying that I don't have the required fml library, but without a version:

Details:
	Mod File: NO FILE INFO
	Failure message: Mod File yet_another_config_lib_v3-3.6.6+1.20.1-fabric.jar needs language provider javafml: to load
		We have found 47
	Mod Version: NO MOD INFO AVAILABLE
	Mod Issue URL: NOT PROVIDED
	Exception message: MISSING EXCEPTION MESSAGE

crash-2025-03-28_15.48.28-fml.txt

I'm using Forge, but with Sinytra connector and the Fabric version of the config lib in order to support a fabric mod.

I had the same error, but when I installed the Forge version instead of Fabric it miraculously worked ( even though it's a dependency for a fabric mod ?)

I've had good luck with version 3.6.2 and below.
hope this helps!

Having the same issue, perhaps Sinytra needs an update?