title: Ad hoc distribution: App failed to install
body: <p>I have created an ad hoc archive and a .ipa file for the application I am trying to distribute.  I have also created a distributing provisioning profile with the UDIDs of the devices that I plan on distributing my application to.  When I drag the .ipa and .mobileprovision files into iTunes and try to sync the application to the device, an error message on the phone pops up reading "'myapp' failed to install". By the way, I have a standard iOS developer's license ($99 per year) and am using Xcode version 4.2.1.  I am pretty new to the developer program, so please try to keep your answers as simple as possible.  Let me know if you need any extra information.  Thank you!</p>