Hey guys,

I was doing Project 2 of the 100 Days with Swift program.

When I try to run the project, it says, Build Succeeded, but before it can run, the following error pops up:

Thread 1: Exception: "<Project2HWS.ViewController 0x7fc38ed0b360> setValue:forUndefinedKey:(https://): this class is not key value coding-compliant for the key score."

Does anyone know the solution?

Thanks!

Not out see you code. You have probably made a mistake in the code somewhere

This usually happens when you have @IBOutlet in your storyboard but your swift class does not have outlet with the same name. But hard to say what is wrong based on just the error.