Xamarin iOS. Debug is not enabled in the current configuration

When you've created a Xamarin iOS project sometimes (especially when you've copied build configurations around), you get this error:

  • Debug is not enabled in the current configuration. Please Start Without Debugging or change it in Properties -> iOS Build.

To resolve this issue, enable this option:

iOS Debug

The error is a bit misleading. The option is under iOS Debug rather than iOS Build.