if signupMode {
    let user = PFUser()
    user.username = emailTextField.text
    user.email = emailTextField.text
    user.password = passwordTextField.text
    user.signUpInBackground(block: {
       (success, error) in

if error != nil {

    let displayErrorMessage = "Please try again later"

    if let errorMessage = error.UserInfo["error"]? as String {
        displayErrorMessage = errorMessage
    }

self.createAlert(title: "Error", message: "Parse Error")
}

user.signUpInBackgroundWithBlock {
    (succeeded: Bool!, error: NSError!) -> Void in
    if error == nil {
      // Perform a segue, show a message or whatever you want

    } else {
      let errorString = error.userInfo["error"] as NSString
      // Show the errorString somewhere and let the user try again.
    }
  }

if let errorMessage = (error! as NSError).userInfo["error"] as? String {
    displayErrorMessage = errorMessage
}