You have reached the point, where you have created your screens, and you wish to see your app running. You press the "Test app" button, and press "Run." However, this error message appears on your screen.
This error is a common one, and can be quickly resolved! All you have to do is set the first screen (which is called Launch screen) you would like to appear on your app.
- Go to Application Info > Launch View Controller and press Change.
- The list of your created view controllers will appear.
- Select the one you want and press run! The selected screen should be the first one you see.