Xcode 6.4 fails to start the simulator

Build Environment Mobile
1

Xcode 6.4 can sometimes fail to start the simulator in the multi-Xcode installs. There is an open issue about that, right now you can work around it by adding the following to your circle.yml:

machine:
  xcode:
    version: "6.4"

dependencies:
  pre:
    - sudo rm "/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS 9.0.simruntime"

Please mind that this only applies to Xcode 6.4, if you are using Xcode 7.0 or 7.1, this issue is not present on those Xcode versions.