Responder a:"err" message on the display, the answer is not clearHi, I got the "Err" display on the lED in my Nikon D80 suddenly when I turn on it to take few images. wouldn't auto focus, hear the shutter but no image saved. I go through all the above procedure, i.e., cleaning of the Aperture Control Unit, replace the memory card and the "err" is still coming on the LED. Could anyone please help me to come out from this. if the problem will not gonna solve then will send it to service centre.