I have bought a Canon A1 two months ago and already this is the second malfunction. So the thing is, out of nowhere I get the error message in the viewfinder. Using my camera on apperture priority all the time, when I get the message, to try and fix it, I use all the methods I know - changing the mode from Av to Tv, manual mode, taking off and puting back on the lens (older 50mm 1.8 with silver ring)... Basically, I am tampering with it until fixed. And, no, I have no idea what it is that I do so it starts working again. It happened to me just a few times but I need a reliable camera. Any thoughts? Just to mention, on manual mode it works fine, apperture, exposure and all.