apollo-ios: Code signing problems due to Apollo framework

I just finished debugging a bunch of problems I was having submitting a build to TestFlight, and the root of the cause seems to have been the check-and-run-apollo-codegen.sh file in the Apollo framework (installed via Cocoapods). I removed that file from the project and temporarily removed the run script from my own project build phases, and the code signing finally succeeded. Here is the error I got:

ERROR ITMS-90035: “Invalid Signature. Code object is not signed at all. Make sure you have signed your application with a distribution certificate, not an ad hoc certificate or a development certificate. Verify that the code signing settings in Xcode are correct at the target level (which override any values at the project level). Additionally, make sure the bundle you are uploading was built using a Release target in Xcode, not a Simulator target. If you are certain your code signing settings are correct, choose “Clean All” in Xcode, delete the “build” directory in the Finder, and rebuild your release target. For more information, please consult https://developer.apple.com/library/ios/documentation/Security/Conceptual/CodeSigningGuide/Introduction/Introduction.html”

Hopefully this will help any one else having this problem