This is likely caused by the UDID of your device not being added to the mobileprovision file.
1. Obtain your device ID (UDID) from iTunes or Xcode.
2. Go into the iOS Developer Center, add the UDID, and then edit the mobileprovision file to include that UDID.
3. Download that mobileprovision file and rebuild your app using that file.
Your app should appear when you load it.