What is fEE when this shows in my camera?

I have an AF 50mm f/1.8 lens D for my Nikon D90.every time i change to f/4 or f/1.8 this fEE shows.
Does this means it only works in f22 and in M mode? Any advice greatly appreciated.

No, it means that you should put the aperture ring on f22 and keep your fingers away from it. You set the aperture in A mode via the body, not the lens.

If you want to use the aperture ring on the lens, set the camera to M mode. When using other modes, the aperture ring should stay at the highest f/number. Use the lock if there's one.