title: 'PFUser' does not have a member named 'subscript'
body: <p>I don't have enough reputation to post the images,
  I'm using Parse to signup and it shows me 'PFUser' does not have a member named 'subscript' error</p>
  
  <p>Please check the code below</p>
  
  <pre><code>var user = PFUser()
      user.username = usernameTextField.text
      user.email = emailTextField.text
      user.password = passwordTextField.text
  
      let imageData = UIImagePNGRepresentation(self.profileImage.image)
      let imageFile = PFFile(name: "profilePhoto.png", data: imageData)
      user["photo"] = imageFile -&gt; [error in this line]
  
  
      user.signUpInBackgroundWithBlock { (succeeded, error) -&gt; Void in
  
          if error == nil {
              println("Signup Successful")
  
          }
          else {
              println("Signup Failed")
          }
  
  
      }
  </code></pre>