FB C# SDK help required

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C#

ASP.NET

I am working on Facebook C# SDK of codeplex

I am having an issue

I have one desktop app and one web app both have a button on them and i want to click on the button and it'll open an FB application which i have made

I have made a sample application(named Test) on developers.facebook.com,i got appID and appSecret

and i provided these in both of my apps(ie desktop and web)

The problem is that when i click Button on desktop app it opens the FB windwow and after that it redirects to my sample app

but when i click the button on web application it opens the FB window and shows an error msg

An error has occurred in Test.Try again later

when i click ok,it redirects to FB login page but its not redirecting to the application after logingin

Can anyone tell me the solution