when clicking link for adding facebook account i get sent to sign in page and i complete only to get a ( see below)

Server Error in '/' Application.

Value cannot be null. Parameter name: accessToken

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.ArgumentNullException: Value cannot be null. Parameter name: accessToken

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:

[ArgumentNullException: Value cannot be null. Parameter name: accessToken] Facebook.FacebookClient..ctor(String accessToken) +183 BoatLogger.Controllers.d57.MoveNext() in c:\Users\Alvin Chua\Desktop\Programming\BoatLogger\BoatLogger\Controllers\AccountController.cs:598 System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +144 System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +84 lambdamethod(Closure , Task ) +57 System.Web.Mvc.Async.TaskAsyncActionDescriptor.EndExecute(IAsyncResult asyncResult) +116 System.Web.Mvc.Async.<>cDisplayClass3f.b3e(IAsyncResult asyncResult) +22 System.Web.Mvc.Async.<>cDisplayClass39.b33() +120 System.Web.Mvc.Async.<>cDisplayClass4f.b49() +452 System.Web.Mvc.Async.<>cDisplayClass37.b36(IAsyncResult asyncResult) +15 System.Web.Mvc.Async.<>cDisplayClass2a.b20() +33 System.Web.Mvc.Async.<>cDisplayClass25.b22(IAsyncResult asyncResult) +240 System.Web.Mvc.<>cDisplayClass1d.b18(IAsyncResult asyncResult) +28 System.Web.Mvc.Async.<>cDisplayClass4.b3(IAsyncResult ar) +15 System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult) +53 System.Web.Mvc.Async.<>cDisplayClass4.b3(IAsyncResult ar) +15 System.Web.Mvc.<>cDisplayClass8.b3(IAsyncResult asyncResult) +42 System.Web.Mvc.Async.<>cDisplayClass4.b_3(IAsyncResult ar) +15 System.Web.CallHandlerExecutionStep.OnAsyncHandlerCompletion(IAsyncResult ar) +282

Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.34212

code.

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