You're out of memory. You probably filled it up with pics you took because you don't have a memory card to save them to. Delete some stuff to free up space. Go to Options/Status and check File Free. You need to keep it above 12000000.
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Right, what Civic said. Also do a search for "memory optimization procedure" to free up some other junk. Pearls don't have anywhere near enough free memory, so you have to be real careful and vigilant. It's a bit of a pain but you get used to it.