I recently purchased a Canon 10D and took approx. 150 pics at a park during the day. Everything was fine. this weekend I was photographing a wedding and 5 shots into the wedding I got the Err 02 message. I took the card out and reformatted it in the a Canon Rebel and it worked fine. I am not sure if I tried to review a photo before it was completely written to the CF card. Has anyone else ran into this problem?