Thunderbird webmail plugin broken

Grendi <[email protected]> Sat, 17 Dec 2005 18:08:37 +0100

Newsgroups	gmane.comp.mozilla.devel.windows
Organization	Another Netscape Collabra Server User
Message-ID	<[email protected]>

Hello everybody

When using the Webmail plugin in order to read my Yahoo inbox in 
Thunderbird, I get this message:
"sending of password did not succeed. Mail server localhost responded: 
negative vibes".

What should I do?

My system:
Windows XP Pro SP2 english
Thunderbird 1.07
Webmail plugin 0.3.4
Yahoo plugin 0.2.17

Thanks
-g