I can't sync my iPhone 4S to my laptop. It says a Unknown error occured (-50). What does that mean and how can I do to fix it?

I am having trouble syncing my iPhone 4S and need your help please. When I start sync my phone it off syncing fine, but then a box comes up say that it can't sync my iPhone because of an unknown error (-50). What does it mean and is it easily fixable? Or do I need to get it looked at?
Thanks,
Christy

Try deleting the iPod photo cache, as described here:
http://support.apple.com/kb/TS1314

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