Failed to chmod user/Library/Developer/CoreSimulator/Devices NO Such File Or directory
I had this issue, where it would run it every time I deleted the app from the simulator, but when I tried to run it second time this error would show.
I solved it by resetting the iOS Simulator from the top bar menu.
Xcode 9.0:
Hardware
→ Erase All Content and Settings...
Pre Xcode 9.0:
Simulator
→ Reset Content and Settings...
I solved this with restart iOS Simulator: Hardware -> Reboot.