Error 45054 in Updating

Hi

After migrating to my new MacBook Pro (a 2 day process...), I tried updating my ipad/iphone apps. I've got the latest itunes, and I see the apps that need updating. When I press "update all apps", iTunes goes to the store to download and then a popup appears saying "unknown error -45054", to try again later.

I've rebooted, unplugged the devices, but after an hour the problem still exists. On my "old" MacBook Pro, I can update the apps, so it's obviously a problem in my new Mac.

Anyone know what to do???