"Unable to add user" recurring error message

[Lord Flame Stryke]

I keep getting the recurring error message reading “Unknown error (204): <ml><d n="yahoo.com"><c n="{username}" l="1" t="32" /></d></ml>”  over and over again.  I have removed the contact from my contact list, yet I still get this message.  If I close it, it just pops up again.  This has happened ever since I installed Pidgin.

Any assistance you can provide would be greatly appreciated.

Thanks.
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