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try downloading bloo.. and see if it works.. mines is working fine
This is a big issue ... and the reason being is that i should not have to work around on pre installed software .... we can not delete this faulty, less than exciting application so they should be high level urgency to fix this situation ... I've emailed them from the market and i suggest that everyone who is experiencing issue do the same and get this issue escalated and taken care of
email them!! ..... Android-support@facebook.com
I just emailed them. Told em if they can't fix this issue, they suck at life...

In case you haven't noticed, the notifications are working again, only took em 2 weeks to get it working again....
Just started happening to me last week. Been getting that error message for over a week now. Have tried everything I can think of without success.