iOS Missing 64-bit support



After rebuilding an older Steroids extremly basic app with 5.0.1 I recieved the error below when uploading to iTunes Connect with Application Loader 3.0. Is there something I should be doing differently?

Missing 64-bit support. iOS apps submitted to the App Store must include 64-bit support an be built with iOS 8 SDK or later.



I installed the latest OS on the MacBook Pro and that seemed to solve my problem.