Getting exception while integrating face book with wp8.1?

I Have integrated facebook sdk in my windows phone 8.1 app and used facebook controls after downloading from NuGet.
However when I navigate to that facebook page, I get a "TargetInvocationException" and goes to Application Unhandled method where the debugger breaks, and the app crashes.
This is the exception: "An unhandled exception of type 'System.Reflection.TargetInvocationException' occurred in System.Windows.ni.dll"
Do I need to do anything else after downloading refrences from NuGet?.