Why do i keep getting this message?

I just synced my iTunes library to my iPod and now when i try to sync it to my iPhone it tells me, "The IPhone Ivola Daniels is synced with another iTunes library on '6530BIMAGE'. Do you want to erase this IPhone and sync with this iTunes library?"
Then it also says "An IPhone can be synced with only one iTunes library at a time. Erasing and syncing replaces the content of this IPhone with the contents of this iTunes library."
Why can't i sync it without erasing. And will it take stuff of my iPod once i sync it?Why do i keep getting this message

Are you Ivola Daniels? Or did you buy this device used? If you ARE her - figure out which computer and library you want to use (I confine myself to uploading music form only ONE of my computers - makes it easier.) If you are NOT her - then do what the directions say, erase Ivola out of your life, and add YOUR stuff. Nice name, though - never heard it before.

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