Just recently the problem suddenly occurred and my camera started flashing Err. If I change it to manual mode 'M' the M does no flash like the P does, same with the metering system, but no matter what I try the shutter speed, it never reverses. One more thing, I've already read the manual, pressed the green reset buttons, taken out the batteries and taken out the lens? Any other options?
Added (1). I'm sorry I meant the F90X
>>> Nikon D90X flashing Err, P and metering system?