The "table-of-contents" on the memory-stick has become corrupted.
If you have pictures on that memory-stick that you want to "rescue", search online for "file scavenger" software.
If you think that the memory-card is "empty", put the memory-card back into your camera, and tell your camera to 'FORMAT' the memory-card, i.e., to initialize it back to the "factory" settings.
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