Swift: The supplied Facebook session token is expired or invalid - swift

Question

I am trying to use FacebookLogin with Parse however i am receiving an error that,
The supplied Facebook session token is expired or invalid
every time I try to login using the code below.
import Foundation
import UIKit
class LoginViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
let permissions = ["public_profile", "email"]
PFFacebookUtils.logInWithPermissions(permissions) {
(user, error) in
if (user == nil) {
if (error == nil) {
println("User cancelled FB login")
}else{
println("FB login error: \(error)")
}
} else if user.isNew {
println("User signed up and logged in with Facebook")
} else {
println("User logged in via Facebook")
}
}
}

Answer 1

I had this error once and had to put this line before the login call in Objective-C
[FBSession.activeSession closeAndClearTokenInformation];
I can't seem to find the swift equivalent in the Parse SDK, and the Facebook SDK is still only in Objective-C.
You may have to add this line to an Objective-C file, and then call on it from your swift file. Check out this question on how to do that
How to call Objective-C code from Swift