XCode iPhone deployment error, courtesy of Adobe AIR

You might be wondering how Adobe AIR could cause an XCode/iPhone error. Apparently it can:

If you start getting the following error, "A valid signing identity matching this profile could not be found in your keychain", Adobe AIR may be to blame.

AIR apparently can change the default keychain and this breaks XCode's provisioning. The fix is to set the login keychain as default using Keychain Access.