minecraftPlayerAnimator is required for Better combat and Combat roll to work. Those mods have 1.21.1 releases, this mod does not. I would really love a 1.21.1 update, as i had been using those in a shared modpack.

I had the mod working on my local modpack instance by simply changing the META-INF neoforge.mods.toml file to read versionRange = "[1.21.1,)" which surprisingly worked without issues. I know a bit more will need changed for the build to work. I tried briefly, but the built jar file was not working for some reason. I thought i got the gradle settings right, but i get dozens of errors from the library files compiling.

But given 1 simple change to the jar file worked, i still think a 1.21 to 1.21.1 port should be a very simple change.