Can you provide your site information so I can take a look-see? Also, what browser are you using?
This is a new error to us (slightly different than above). It's also mentioned in the thread below, but that user said it went away on it's own. It's possible Facebook itself was having a bad day, but if you're still seeing it, we'll happily investigate.
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Fatal error: Uncaught exception 'FacebookRestClientException
