When I open Xcode 7.0 beta version, I cannot create a simulator. I click the blue button and nothing happens at all. No error message is displayed and I get no feedback.
Xcode -> Preferences - > Downloads does not show any SDKs to download.
go to "/Library/Developer/CoreSimulator/Profiles/Runtimes" and removed the runtimes
This work for me. Credit: https://forums.developer.apple.com/thread/11706
The Xcode beta version is not using the newest command line tools; you can set the correct version in Xcode -> Preferences -> Locations -> Command Line Tools.
Credit: I found the solution here; it seems like the same error but Xcode 7 doesn't give me an error message (or any feedback)