System.ArgumentNullException: Value cannot be null. (Parameter 'authorizationToken')
   at Channel.Models.User.UserConfig.Load(String authorizationToken) in D:\Akbar\Git\Channel_Nopcommerce\NopCommerce\Models\User\UserConfig.cs:line 26
   at Channel.Controllers.OAuthController.Get(String code, String state) in D:\Akbar\Git\Channel_Nopcommerce\NopCommerce\Controllers\OAuthController.cs:line 21