Can't click on ennemies

It's been a day that i can't attack ennemies. When i click on ennemies, nothing happens, but otherwise, when i click on my chest or anything else, it works. I checked if i got enough stats for my weapons or abilities and its good. So i don"t understand why i can't attack enemies. And when i go to the keyboard assignements, the 1st skills is in grey, i can't choose a keybind. I delete and download again and nothing happend