flex4 and webservice "Cannot resolve element definition for ref "

Question

hi,everybody.

my english is not so good,but i still hope someone can help me.

when i was try to visit my webservice from .net ,the flex4 has show this error:

"Cannot resolve element definition for ref 'http://www.w3.org/2001/XMLSchema::schema'"

and i can't find out the problem.

I'm upset for several days.

here is a link,it's close to my question :

click me to the web

bestwish for u !