Error completing album in iTunes Store on Mac

I keep getting an error when I try to "Complete album" on the iTunes Store. Within the Music application on my Mac, I can chose an album and at the bottom of the page under all the songs that I have purchased related to that particular album it says "Show Complete Album." clicking on the link displays the complete album in the iTunes Store and it gives me the option to "Complete my Album." But, on the iTunes Store main page, there is a link that says "Complete my Album." but I get a strange error message.

I am including three screenshots. First from my Music application.

Then from the main iTunes Store page

And finally the strange error message. Notice th faint working in the background.