Cannot call value of non-function type "UIViewController?"
<p>I want to make an alert dialog showing up with messages and here's my code in ViewController.swift:</p>

<pre><code>func showErrorAlert(title: String , msg: String){
    let alert = UIAlertController(title: title, message: msg, preferredStyle: .Alert)
    let action = UIAlertAction(title: "OK", style: .Default, handler: nil)
    alert.addAction(action)
    presentedViewController(alert, animated: true, completion: nil)
}
</code></pre>

<p>The last line is giving me an error:</p>

<blockquote>
  <p>"Cannot call value of non-function type "UIViewController?""</p>
</blockquote>