Xamarin.iOS - Why do I get the error: "Native linking failed, undefined Objective-C class: SBSBarcodePicker"?

If you are getting the following error:

Native linking failed, undefined Objective-C class: SBSBarcodePicker. The symbol '_OBJC_CLASS_$_SBSBarcodePicker' could not be found in any of the libraries or frameworks linked with your application.

Please check you have  incremental builds disabled (Options-->iOS Build).