facebook xmpp

[Nigel Fearnley]

Hi
I hope you can help

my pidgin facebook chat has stopped working. it was working fine 2 days 
ago, i am using linux mint11 and pidgin 2.10.0
i get an error message at the bottom of the buddy list

nigel.xxxxxxxx at chat.facebook.com/home disabled
server closed the connection

pressing the Re-enable button does not work. i have deleted the account 
through account manager and added it again several times but still with 
no success

does anyone have any suggestion to re-enable and get the server to 
accept the request

Nigel