unity package manager error unity 2019.3.12f1

hello, everyone, I have been using unity for 1 year now and after my last build a unity package manager error popped out of nowhere IDK what am I supposed to do about it I asked a lot of people and they couldn’t help me so plz help me.

I wish this picture can help you 158290-no.png

did you manage to fix the problem? I have the same mistakes