When you use
xcode-build to build your project with Xcode 6.x, you might hit an error like this:
... iPhoneSimulator: SimVerifier returned: Error Domain=NSPOSIXErrorDomain Code=53 "Simulator verification failed." ...
It's not your fault. Many people frustrated by this error especially when you use package management tool like Carthage.
$ $ cd /Library/Developer/CoreSimulator/ $ sudo chgrp -R wheel Profiles/
It's not necessary for you to waste another 30 minutes to dig around Internet to find the answer(I already did that.), but in case you want to know what's the reason behind this issue, here is a brief answer:
Some Xcode engineers screwed this.
For a lengthy answer, checkout these pages: