Errors while syncing iPhone I did a restore on my iPhone 3GS running the latest 4.2.1 (after a failed attempt at jailbreaking).

For whatever reason the applications won't sync. For each of the apps it gives me an error:

The app "iDivide" was not installed on the iPhone "iPhone" because an unknown error occured (0xE8000001).

I've shutdown and restarted the phone, all to no avail.  Everything else seems to sync fine (photos, podcasts, etc...).

How do I sync my apps?
Many resources out on the web seem to suggest that 0xE8000001 occurs because of iTunes/associated daemons, not your device itself. Most folks report success after quitting iTunes, and using Activity Monitor to force quit the iTunes Helper, and any other process referencing iTunes, iPod/iPhone, etc.

A blanket search for 0xE8000001 reveals most of these sources.