a few hours ago i uploaded a new app to itunes.
Recently i became an email from apple...
We have discovered one or more issues with your recent submission for "Mathe 2.0". To process your submission, the following issues must be corrected:
This bundle is invalid - New apps and app updates submitted to the App Store must be built with public (GM) versions of Xcode 5.1.1 or higher and iOS 7 SDK. Do not submit apps built with beta software.
Once these issues have been corrected, use Xcode or Application Loader to upload a new binary to iTunes Connect. Choose the new binary on the app’s Details page in My Apps on iTunes Connect, and click Submit for Review.
The App Store team
So what can I/we do?