I am getting a "Use of Unresolved Identifier Error". Help?!

I am brand new to this…but so far I have installed CocoaPods, and am tinkering with Xcode. I am following the instructions from https://docs.particle.io/guide/how-to-build-a-product/mobile-app/

I am using Swift, so I have added a bridging file and imported SparkSetup.h. Everything builds just fine, and runs on the Simulator, until I add the code that adds a function to the Setup Button; I get the error "Use of unresolved identifier ‘SparkSetupMainController’

I have gotten this far reading the comments and responses from @ido and @Bendrix, but can’t get past this error!

Any ideas?

Did you ever resolve this?