1) Disconnect all iOS devices from your computer and quit iTunes/Apple Configurator
2) From the Finder, choose Go > Go to folder.
3) Type the following and then press Return: /var/db/lockdown.
4) Choose View > as Icons.
The Finder window should display one or more files with long alphanumeric file names.
5) In the Finder, choose Edit > Select all.
6) Choose File > Move to Trash. Enter an administrator password if prompted.
Note: Don't delete the Lockdown folder itself. Delete only the files contained inside the Lockdown folder.
7) Reopen iTunes.
8) From the top menu bar choose Store / Authorize This Computer
9) Enter the iTunes user name and password used to download the apps (NOT the one used to purchase spreadsheets)
Repeat for each account used to download apps
10) Reimport an app in to Apple Configurator (you can just over-right any app, free or paid)
This should prompt you for the same user name and password used in iTunes
Again, repeat if different iTunes accounts were used to download any apps
Reconnect your iOS device and test.
These instructions can also be found at http://support.apple.com/kb/TS2529 but they do not address Apple Configurator in the article.
This walk through will help remove most errors exept 9517 or NULL. Those errors are not fixable and VPP support will have to replace your codes.
Hope this helps