hello. My name is***** can help you with your question. This can happen if the card is not formatted correctly or if something on the card has been come corrupt. When I say not formatted correctly, I mean that it may not be formatted to the cameras liking even if it's technically correct. So what I would suggest doing is putting the card in the camera and then from the cameras menu, go to the memory options and format the card from there. This is the best way to make sure that it will be compatible with the camera. It occurs very frequently that a card not formatted in a given camera will cause these kinds of issues. Please let me know if this helps or if you need additional assistance.