Recently, I started noticing this problem when trying to sync applications from my PC (Windows 7) to my iPhone4 and iPad2 via iTunes. At the end of the sync, the following errors will appear.
Turns out that Zone Alarm doesn’t play nice with iTunes. I suspect there must be something preventing iTunes from connecting with the App Store to verify licences thus causing that application upload to fail. Here’s a discussion thread with more information.
There may be a Fix in the Next FREE version of Zone Alarm..
No ETA of when the Next version will be available other than some time in 2011..
Not holding my breath though.