title: NSUnknownKeyException this class is not key value coding-compliant for the key-changing from Obj-C to Swift
body: <p>I know this question has been asked a lot but the answers do not work for me. For this class:</p>
  
  <pre><code>import UIKit
  
  class ProfileViewController: UIViewController {
      @IBOutlet weak var bioTextView: UITextView!
  
      override func viewDidLoad() {
          super.viewDidLoad()
  
          // Do any additional setup after loading the view.
      }
  
      override func didReceiveMemoryWarning() {
          super.didReceiveMemoryWarning()
          // Dispose of any resources that can be recreated.
      }
  }
  </code></pre>
  
  <p>I have added an outlet from my storyboard to the bioTextView. <strong>There are no other outlets on this view in the storyboard, all I have done is add an outlet and nothing else</strong> and I get the error. There were other other outlets to an <strong>Objective-C</strong> file that I am replacing, and those outlets, along with the file, are deleted. I keep getting this error: <code>Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[&lt;UIViewController 0x7fc86bc08700&gt; setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key bioTextView.'</code></p>
  
  <p>Any answers with clear instructions not written for someone who already knows how to code in Xcode would be greatly appreciated.</p>