Can anyone help me create a Unity Package out of this Blend File?

[CiniaHime]

I am having trouble using this blend file as I want to make it into a VRChat Avatar but it is not wanting to transport over to a FBX in order to become a Unity file.

I have been struggling with this for quite some time and it is really getting on my nerves. Any ideas on what to do?

If it comes down to it, I can send the Blend file over to someone if that makes it easier.

[CiniaHime]

I have attempted fixing the avatar with C.A.T.S but that did little to nothing.

[Nuko_Maruki]

since you're using Blender 4.0.0, You should probably use the unofficial CATS addon instead of the official one since the official cats addon doesn't receive updates

(make sure to use the latest version made for your version of Blender)
https://github.com/teamneoneko/Cats-Blender-Plugin-Unofficial-

[乃ㄖ乃 Ü]

Me who’s converting unitypackage into blend so i can port models into gmod.