I've got a few month old Canon T3i that has worked great till this morning...and I'm getting ready to go to the zoo! AAARRRGGGHHHH Anyways, it works just fine with my 18-55mm lens but when I switch out to my 55-250 I get the Err01 message that the camera can not communicate with the lens. I've cleaned the contacts and made sure none were stuck down but still no luck. I've also removed the battery with the same results. When I try to change the aperture settings it says F00 and "no lens attached". Anything I've overlooked or is it time to have a lens replaced....both lenses were bought new with the camera for christmas... The lens worked just fine when I used it about a month ago and it's been stored in a secure hard case since then.