Two Fron View Controller

[mnifaf]

hay i have a Login VC
After Login successfully
i want to navigate to front view controller on the basis of UserType
There are tow user type Customer and admin
I want two tow sw_front view when user is admin it goes to Admin front view vice versa
Because when i write below code in login vc
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let logInViewController = storyboard.instantiateViewController(withIdentifier: "Admin") as! AdminVc;
self.revealViewController().setFront(logInViewController, animated: true) . // (* this line)
But i fond error
unwrap while value is nil on (* this line)

// after login this below code must be run for redierect views
If(loginUser == Admin){
must be move to admin front vc here
}else {
must be move to customer
}
Help