While shooting a wedding, my 5Dmark II showed an error and locked up. I turned off the camera and turned it back on. I took one more picture and it locked up again. I turned it off and replaced the card, with no further issues. When I tried to download pictures in error card, nothing showed on the computer. The computer is asking me to formatt the card again. I have never had any problems with the Lexar Plat II 80x cards before. What can I do to recover my photo????