the installation process we are using is completely iOS driven,
we just trigger it to start. So the error is something iOS
internal, we can't do anything about from our side.
So, these are just some ideas, we can't tell you exactly what
the problem is:
- Did the user try to restart the device and try again? - Is the
device jailbroken? Maybe that is causing the problem. - Does the
installation work manually by downloading the app and installing
via Organizer or iTunes?