It doesn't. I've found out the error though, its because when i run runClient, it starts with forge version 204, however this bug has been fixed in the latest version
--fml.forgeGroup, net.minecraftforge, --fml.forgeVersion, 25.0.204,
I've installed the latest version of forge, but do you know how to make it so runClient uses the latest version, not 204?
Edit: Fixed it, ty for the help