The Given Key was not present in Dictionary Error in Silver light

if the silverlight application is in .net4.0 and the SL wcf service application is in .net3.5 then we receive the below error as "The Given Key was not present in Dictionary".

to rectify this..

go to your wcf service web.config,
- change the endpoint tag binding text to "basicHttpBinding" (need to change the 2 lines of the end point tag)

URL:

http://forums.silverlight.net/t/18559.aspx/2/10
http://go4answers.webhost4life.com/Example/the-given-key-not-dictionary-161463.aspx