C:13:01 format error

i have a sony dsc-p72. i took some really important picture with my camera. i was viewing the pics on my camera and an hour later i went to save and print my pics at costco and i only had 19 of 136 pics. all my other pics say format error C:13:01. is it possible to still save those other pics because i only have the 19. what can i do and i really need a lot of help. is something wrong with the camera or the memory stick?

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