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Swift wont set background button image


I am having trouble getting my swift code to display a profile picture in the background of a button. Here is my code:

import Foundation
import Parse
import UIKit

class MainMenu: UIViewController{

    var profileActionButtonTextValue: String = ""

    @IBOutlet weak var ProfilePicture: UIButton!

    @IBOutlet weak var ProfileActionButton: UIButton!

    override func viewDidLoad() {

        //Setting the label for the ProfileActionButton to the current users name(parse)
        ProfileActionButton.setTitle(profileActionButtonTextValue, forState: .Normal)

        //Attempting to retrieve current users profilepicture from parse and input into Profile Picture UIImageView

        if let userProfilePicture = PFUser.currentUser()?["profilepicture"] as? PFFile{
                (imageData: NSData?, error: NSError?) -> Void in
                if (error == nil) {
                    let image = UIImage(data:imageData!)
                    if(image == nil){
                        self.ProfilePicture.setBackgroundImage(image, forState: .Normal)