yahoo mail: server failed to send back valid XML?

[fapri]

the error message is attached below, i've read up on some of the questions here but comparing the error messages, i think this one is a bit different in that it occurs on 0,0 and the message that no html was present in the http response.

its been going on for a few days now and i thought that it was a glitch they were working on already, but after searching a bit and found no one else reporting exactly the same error, i decided to post.

so any ideas? i've been using ymail for years and been using the new ymail for a long,long time now, first time this happened to me.
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The server failed to send back valid XML. Please contact Yahoo! Customer Care and let them know what you were doing when you saw this message. Thanks!
Method: ListMessages HTTP Status: 500 Status Text: Internal Server Error 99
XML document must have a top level element.
Line: 0 LinePos: 0

No HTML was present in the