看起来Apple今天有一些技术问题。它与XCode版本无关。我现在看到与XCode 7.0.1相同的错误。重新添加帐户无济于事。

Looks like Apple has some kind of technical issues today. It's not related to version of XCode. I see the same error with XCode 7.0.1 right now. Re-adding account will not help.