I'm getting an error connecting to my storyboard. I have a navigation controller connected to my view controller as a root. Everytime I play the application, it crashes. I get this error: 

> 
> Unknown class ViewController in Interface Builder file.
>  (lldb)
> 
> 
> scene is unreachable due to lack of entry points and does not have an identifier for runtime access via -instantiateViewControllerWithIdentifier-
> 
> 
> 

What's this even mean?

My view controller is defined right under the normal code.

```
import UIKit
class ViewController: UIViewController {

//some code here

```