Error Message while trying to weight paint

I keep getting this error message when I try to weight paint. (It also happens when I try to manually assign vertices’s to the bone group.)

ERROR! Operation only available for multires level 1

Does anybody have an idea what this means and what I can do to fix it? Thanks in advance.

are you using a multres mesh?

change to level 1 (base mesh) and then weight paint

if you didn’t mean to use a multires mesh you can remove it or apply it

Turned out I had the Multires tab minimized and haven’t touched that control in ages. Thanks