WebServiceProxyFactory() returns "Failure Processing WSDL Document"

[email protected] (Christophe Thi?baud)
Newsgroups gmane.comp.mozilla.devel.xml
Organization http://groups.google.com
Message-ID <[email protected]> 
I'm trying to use WebServiceProxyFactory() to use this WebService:

http://www.openmozart.net/servlet/services/Koechel?wsdl

Unfortunately after the createProxyAsync() I get an error: "Failure
Processing WSDL Document" 

looking at error object with venkman there is a '80780004' code. 
is there any description available of this error code ?
is there any way of obtaining a more significant error message ?
is there something wrong with my wsdl (BTW, generated by axis) ?
has anybody encountered and solved this type of problems before ?

using Mozilla 1.7b + tweeked sample script at
http://mgalli.com/wsdom/moz-crossportal/fs-4/

thanks in advance

CT
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