Hi,
Not Found is a generic error on Silverlight which can mean a lot of things - cross-domain issues, any non-200 responses from the network, etc. There are a few things you can do, such as enabling tracing on the server side, or looking at the network traffic
with a tool such as Fiddler, which will give you more information about your error.
Please check link below has some information which are useful when debugging WCF calls made by Silverlight:
http://blogs.msdn.com/b/silverlightws/archive/2008/04/16/debugging-web-service-usage-in-silverlight-2.aspx
Best Regards,
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