The iPhone iPad user could ever have this problem if the applications are not synched to the phone, because an unknown error occurred 0xE8008001 (sometime, when you’re using Angry birds or iTunes apps) which could not be installed because the applications for the iPhone. In fact, the error occurs when you try to install it directly. IPA image of the iPhone iPad , a mobile installation because iTunes does not support this.
To resolve this problem, you can jailbreak your iPhone iPad , then install a application called Cydia AppSync. AppSync wull spots in the Mobile installation files, and allows you to get rid of the error in iTunes.