i fixed it by restarting blender

I had both setted up, thats weird and i do have materials but i havent added them to the blender model yet

So i tried to export this model and im getting errors, heres a picture of the messages:
https://pasteboard.co/JU9imV6.png

and here's the blend file:

https://www.dropbox.com/s/1uvepgz2jwlsb3n/scar.blend?dl=0