Error running playground. Unable to find suitable target device. (iOS Swift)

Question

I created a new project in XCode.

File > New > Playground (option+shift+cmd+N)

Answer 1

From the developer forums, this worked for me:

1. Quit Xcode
2. Delete the folder /Users//Library/Developer/CoreSimulator/Devices. For example, in Terminal: rm -rf ~/Library/Developer/CoreSimulator/Devices
3. In Terminal: killall -9 com.apple.CoreSimulator.CoreSimulatorService (or just reboot).