If that's really the problem, then they should show us a message that doesn't put us into panic mode. I wasted time reinstalling Mountain Lion, as well as the most recent app that I had installed. I have to decide later this year whether to buy an iPad or a Surface, and this kind of thing is going to play a part in my decision.
I would like to add the error code I got, and then the solution I used to solve it.
I Was getting NSURLErrorDomain error -1012. To solve the problem, I had to reset my account password, which I had just changed Nov 9th. Trying to use the password that I changed it to again, it told me I can't use a password I used in a year, so obviously, I wasn't getting the password wrong they were forcing me to change it.