But the lone clue I did find is that the card with the pictures were altered in a PC or other thing. It appears if you format the card in the camera it should work again.
http://h10032.www1.hp.com/ctg/Manual/c01982078.pdf notes the file error on page 36 but is not telling you how to fix it.
Page 43 tells where the format command is. Be sure to copy out any pictures you need before doing this.