Wss v3 and GetListItems returns "Value cannot bu
null"

Hello everybody,

Using WSS v3 ands the Lists.asmx Web Service, I'm trying to develop a little
application that will list of the content of a particular library.

But I get an exception on the call to GetListItems: "Value cannot be
null".

 

What is strange is that a similar code works fine on the same machine....

 

Do you have any idea ?

 

Thanks