Can't create new user using Parse 1.7.2 and Facebook SDK 4.1 in Xcode using Swift

I've linked my app to both the Facebook SDK and Parse, but now I'm trying to integrate Facebook's login with Parse but keep running into issues. My current issue is that the app runs, but when I press the FBSDKLoginButton, it will go to safari and ask for permissions (as it should), but then when pressing okay, it simply returns to the app's login screen like nothing happened and does not perform the segue to the rest of the app. I also checked Parse and it did not create a new PFUser. I will post the code I think may be relevant from my LoginViewController below (that means the code will be missing sections like my viewDidLoad for it has nothing in it that affects the login process):

import UIKit
import Parse
import FBSDKCoreKit
import FBSDKLoginKit

protocol LoginViewControllerDelegate {
    func onRegister(loginViewController : LoginViewController)
    func onFacebookLogin(loginViewController : LoginViewController)
    func onLogin(loginViewController : LoginViewController)
}

class LoginViewController: UIViewController {

@IBAction func onFacebookLogin(sender: AnyObject?) {

    // Set permissions required from the facebook user account
    let permissions = [ "user_about_me", "user_relationships", "user_location", "user_birthday", "public_profile", "user_friends", "user_email", "user_gender"]

    // Login PFUser using Facebook
    PFFacebookUtils.logInInBackgroundWithReadPermissions(permissions, block: {
        (user: PFUser?, error: NSError?) -> Void in
        if let user = user {
            if user.isNew {
                println("User signed up and logged in through Facebook!")
                self.loadData()
                self.performSegueWithIdentifier("loggedIn", sender: self)
            } else {
                println("User logged in through Facebook!")
                self.performSegueWithIdentifier("loggedIn", sender: self)
            }
            if self.delegate != nil {
                self.delegate!.onFacebookLogin(self)
            }
        } else {
            println("Uh oh. The user cancelled the Facebook login.")
        }
    })
}

func loadData(){
    let request:FBSDKGraphRequest = FBSDKGraphRequest()
    request.startWithCompletionHandler { (connection:FBSDKGraphRequestConnection!, result:AnyObject!, error:NSError!) -> Void in
        if error == nil{
            if let dict = result as? Dictionary<String, AnyObject>{
                let name:String = dict["first_name"] as AnyObject? as! String
                let facebookID:String = dict["id"] as AnyObject? as! String
                let email:String = dict["email"] as AnyObject? as! String
                let birthday:String = dict["birthday"] as AnyObject? as! String
                let gender:String = dict["gender"] as AnyObject? as! String

                let hostCount:Int = 0
                let attendCount:Int = 0

                let pictureURL = "https://graph.facebook.com/\(facebookID)/picture?type=large&return_ssl_resources=1"

                var URLRequest = NSURL(string: pictureURL)
                var URLRequestNeeded = NSURLRequest(URL: URLRequest!)


                NSURLConnection.sendAsynchronousRequest(URLRequestNeeded, queue: NSOperationQueue.mainQueue(), completionHandler: {(response: NSURLResponse!,data: NSData!, error: NSError!) -> Void in
                    if error == nil {
                        var picture = PFFile(data: data)
                        PFUser.currentUser()!.setObject(picture, forKey: "profilePicture")
                        PFUser.currentUser()!.saveInBackground()
                    }
                    else {
                        println("Error: \(error.localizedDescription)")
                    }
                })
                PFUser.currentUser()!.setValue(name, forKey: "name")
                PFUser.currentUser()!.setValue(email, forKey: "email")
                PFUser.currentUser()!.setValue(birthday, forKey: "birthday")
                PFUser.currentUser()!.setValue(gender, forKey: "gender")
                PFUser.currentUser()!.setValue(hostCount, forKey: "hostCount")
                PFUser.currentUser()!.saveInBackground()
            }
        }
    }
}
}