I have been struggling with this for some time, filed a bug report with Apple and they claimed I didn't have permission. No reference to what permissions.
Towards the bottom of the log file from the bug report was the following text.
"You don’t have permission to save the file “60ACC3A5-E7E2-4330-869B-15447826C019” in the folder “CoreSimulator”." UserInfo={NSFilePath=/Users/terryburdett/Library/Logs/CoreSimulator/60ACC3A5-E7E2-4330-869B-15447826C019, NSUnderlyingError=0x7fda1871c8b0 {Error Domain=NSPOSIXErrorDomain Code=13 "Permission denied"}}}}}
Follow the path to Logs and getinfo on Logs folder. If your name isn't in the sharing and permissions list, unlock the folder and add it. Change permissions to read/write. Next time you run Xcode it should create an CoreSimulator folder in the Logs folder and compile without bug.
In my case the Logs folder was the only one in the path that I didn't have permission for reading/writing. So check all folders in the path.
So far working good.