Unable to Create Device Set at Library/Developer/XCPGDevices

Question

I'm using Xcode 8 and cannot run a playground. As soon as the playground opens and starts to build the file I get this error:

Under Preferences -> Components in Xcode I do not see any iOS 10 Simulators available for install:

I have Xcode 6.4, 7.3, and 8.0 installed but my command line tools are pointing to Xcode 8. How can I fix this issue?

Answer 1

Restarting my computer and opening Xcode 8 before 7 or 6 fixed this error and made Xcode 8 playgrounds start working again.