DowloadImageWithURL with SDWebImage
<p>I am encountering this kind of error on the completion block of <code>SDWebImage</code>. My goal is to download the image. Here's my code:</p>

<pre><code>let manager: SDWebImageManager = SDWebImageManager.sharedManager()
manager.downloadImageWithURL(NSURL(string: feedDetails.thumbnail), options: [],
    progress: {(receivedSize: Int, expectedSize: Int) -&gt; Void in
    },
    completed: {(image: UIImage, data: NSData, error: NSError, finished: Bool) -&gt; Void in
    }
)
</code></pre>

<p><strong>This is the error that I encounter:</strong></p>

<blockquote>
  <p>Cannot convert value of type '(UIImage,NSData,NSError,Bool) -> Void'
  to expected argument type 'SDWebImageCompletionWithFinishedBlock!'</p>
</blockquote>