My App was successfully uploaded through the App Loader, however 5 minutes later I got an email back from Apple saying this:
We identified one or more issues with a recent delivery for your app, "XXXXXXXXX". Please correct the following issues, then upload again.
Invalid architectures - This app has invalid architecture, and may have been built with invalid build settings or incompatible tools. Try rebuilding the app with the latest Xcode version. If you are using third party development tools, contact the provider.
The App Store Team_