Hi all. Just purchased a second-hand Nikon N90/F90 in good condition. Film loading was fine, and I managed to snap a few frames before a problem came up. In place of where the shutter speed and aperture values are shown (on the LCD screen), there is the flashing "err" word. However, the shutter can still be depressed and more frames taken by the camera. (Although I haven't developed the film yet, and wouldn't know how these images taken with the "err" message turn out). After taking a few frames with the camera flashing the "err" message, everything seems to be okay, and the camera displays the metered shutter/aperture values again. The ISO icon doesn't flash, so I know that it shouldn't be a film speed related problem. It is only the "err" message that flashes. Any advice? Thanks!