I agree the problem is the CF card. I'd like to add that it must have several back to back corrupt files to be refusing formatting. As much as I teach/lecture not to do this I also agree that to save that card place it in a memory card reader and format the card in the computer. Check before hand to see if there are usable pictures and load them to a new file folder before formatting. Once formatting has been completed in the computer check that all pins are in correct and serviceable condition in the card reader slot in the camera before install it back into the camera. Then reformat the CF card in the camera. Each time pictures are downloaded to the computer a CF card should be formatted.
Deleting pictures just causes a huge amount of problems if done repeatedly in favor of formatting.
I'm including some diagrams to show where the formatting mode is located on your camera.
Best of luck
Hope this helps Happy New Year
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