Manifest validation fails when I try to add 'Extensions' to the App element

Question

I have been trying to connect and authenticate my application to facebook but it's shows a failure message when I am trying to add Extensions element to it. The error message says,

"Manifest validation fails: Exception: The element 'App' has invalid child element 'Extensions'. List of possible elements expected: 'IconPath'."

Though it is clearly narrated in the tutorial, http://facebooksdk.net/docs/phone/config/.

Any help is really appreciated. Thanks.

EDIT: It is a Windows Phone 8.1 Silverlight application.

Answer 1

Post it after <tokens></tokens> tag, this works for me

<Tokens>...</Tokens>
<Extensions>
   <Protocol Name="fb<your app id>" NavUriFragment="encodedLaunchUri=%s" TaskID="_default" />
   <Protocol Name="msft-<your guid as configured on Facebook portal>" NavUriFragment="encodedLaunchUri=%s" TaskID="_default" />
</Extensions>