Error code 401 in Yahoo Messenger?

For over a month now I've been getting an error code 401 when trying to look up my conversation history? How can I get this fixed?
Update: I can't update my browser to the latest version because I work on websites not compatible with the latest version of IE. Any other way around this to get this error resolved? I am able to retrieve conversations in my Yahoo mail so I'm confused as to why msgr is generating this error.
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