When I click on the button my app crashes and goes to code "class AppDelegate: UIResponder, UIApplicationDelegate "

Hey Matt Sikorski I think I figured out what was wrong. When I went through the challenge, I accidentally added the function as an outlet first, and having duplicate roles for the same function was blowing everything up.

Here's how I fixed it:

Navigate to the "Connection Inspector" inside the Utilities pane (circle icon with an arrow in it). Look at your "Sent Events." If you notice you have two referencing the same function, that's probably your problem.

I don't know why the problem happens. Perhaps someone with more understanding and time could enlighten us. Thanks!

Check your outlets on your storyboard are all connected. An app can build fine but if it isn't connected then it can cause an error like this. Also check that your optionals are being unwrapped properly sometimes a nil value with a force unwrap with a bang can cause the app to stall out and crash.

Check your outlets on your storyboard are all connected. An app can build fine but if it isn't connected then it can cause an error like this. Also check that your optionals are being unwrapped properly sometimes a nil value with a force unwrap with a bang can cause the app to stall out and crash.