Hi RayCanada,
Welcome to the Support Communities! I'm not sure what steps you have taken so far to troubleshoot this issue, but I have a couple of suggestions for you to try. The first thing I would suggest is to quit all apps and sign out of the iTunes Store on your iPad, disconnect it from your Macbook Pro, and turn it off. Then restart your Macbook Pro.
iOS: Force an app to close
http://support.apple.com/kb/ht5137
iOS: Sign in with a different Apple ID in the iTunes Store, App Store, and iBooks Store
http://support.apple.com/kb/HT1311?viewlocale=en_US
- Tap Settings > iTunes & App Stores.
- Tap your Apple ID.
- Tap Sign Out.
Turn your iPad Air on, and sign into your iTunes Store account using the same Apple ID you used to purchase the apps. Connect it to the MacBook Pro using the Apple USB cable that it came with. Try to sync again with your iTunes library on your Macbook Pro.
Alternatively, you can download any iTunes Store purchased content using the same Apple ID directly to your iPad. Here's how:
Download past purchases
http://support.apple.com/kb/HT2519
Not sure which Apple ID you used to make purchases? You can review your entire purchase history using your computer:
iTunes Store & Mac App Store: Seeing your purchase history and order numbers
http://support.apple.com/kb/ht2727
I hope this information helps ....
- Judy