Facebook Login for MVC application

Question

Hi,

 

I have implemented login with facebook option for my web application(mvc).

But the problem is that at first attempt login with facebook does not log in to the

website but if i do normal login and logout and after that i do login with facebook then it logins into website.

I am unable to understand why this is happening .Please help me to fix this.

 

 

Thanks and regards

Prachi