This is a major bug in Apple's iTunesConnect website. Occasionally, when you see this error message, it is actually the correct message. For most people, though, it's completely the wrong error message - and there is *no way* for you to find out what the real error message should be.
Here are the *known* errors that can cause this message, but have no error message of their own:
- Your binary has an icon that is named something other than "Icon.png" (exact spelling + case sensitive) (How do I set the Icon for my application?)
- Your binary has an icon with the correct name, but it is not precisely 57 pixels wide and 57 pixels high (How do I set the Icon for my application?)
- Your binary has no provisioning profile, please add a provisioning profile (FAQ for this not written yet)
- The application ID inside your build is incorrect, please change it be identical to the App ID you created in the iPhone Developer Program (FAQ for this not written yet)
- You built your binary on a non-standard hard drive, please re-build on a standard hard drive (FAQ for this not written yet)
- XCode corrupted your provisioning profile and included an invalid provisioning profile, please fix your provisioning profile and start again (FAQ for this not written yet)