In order to build and run your tests on Distiller (or any other continuous integration service), you must create Shared Schemes for your application target.
To create a Shared Scheme:
Open up your project in Xcode.
Open up the Manage Schemes sheet by selecting Product > Scheme > Manage Schemes.
Locate the application target in the list. Make sure the “Shared” checkbox on the far right is checked.
Your scheme should now be configured correctly.