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I have recently upgraded DNN to version 9.1. After Upgraded I have Error.
[ERROR] DotNetNuke.Services.Exceptions.Exceptions - ~/Default.aspx?tabid=173&error=An unexpected error has occurred&content=0System.NullReferenceException: Object reference not set to an instance of an object. at DotNetNuke.Authentication.Facebook.Login.AddCustomProperties(NameValueCollection properties) at DotNetNuke.Services.Authentication.OAuth.OAuthClientBase.AuthenticateUser(UserData user, PortalSettings settings, String IPAddress, Action`1 addCustomProperties, Action`1 onAuthenticated) at DotNetNuke.Services.Authentication.OAuth.OAuthLoginBase.OnLoad(EventArgs e) at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)What could be the cause of this?