Maya Bento Face Error

[Sanya Bilavio 1]

Hi everyone, 

Im trying to rig a mesh head to the bento skeleton. Once i smooth bind it and copy weights i get this error when i try and paint skin weights : https://i.gyazo.com/0595cbb24c64e800cd53ad020b4fcde6.png

All the bones are greyed out/locked when i go into the menu : https://i.gyazo.com/1e24050c3815f5cb9c310d9b3bbf651c.png

Ive copied weights the same way in other scenes before with no errors. I checked the bound skeleton and the mFace bone is there.

Any idea what this could be? 

[Medhue Simoni 589]

I'd suggest getting Cathy Foil's Mayastar plugin for Maya. It will make creating Bento avatars much easier.