Developers I\'m supporting just got new Macs with XCode 6.2 (Version 6.2 (6C131e)).
In running xcodebuild we\'re having failures in running against any earlier version
I found this issue too. But my method is to copy the simulator into the SDKs folder and this work at Xcode 6 earlier versions. After I upgrade to xcode 6.2, I found this method did not work anymore.