No Valid iOS keychain when using iPhoneSimulator?

I am attempting to run an example program to learn how to do some complex MVVM proceedures, but when I try to run the application on my iPhoneSimulator I get the following error:

Severity Code Description Project File Line
Error    No valid iOS code signing keys found in keychain. You need to request a codesigning certificate from https://developer.apple.com. DtoToVM.iOS

I haven't gotten this in any of the small programs that I've written and run on the simulator. I understand that this should pop up if I'm trying to run this on an actual iPhone device (since I don't have a developer license). What is going on?

Luke