Xcode 8.0 Command /Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swiftc failed with exit code 1

Happened to me, when I had two classes with the same name in my project. After deleting the redundant one, error disappeared.

If you look above the error, Xcode will tell you which ViewController is added/declared twice, navigate to it and remove the reference. Build and you're good to go.

I am going to tell you my silly mistake, the error is showing the issue and It took 3 hours to me to understand. look into below error

look into above 2 lines of error, the problem is shown, Obviously, In my case Xcode is complaining that Location.swift and Customer.swift file is missing, look into my project hierarchy, the same issue can understand.

It's my advice to everyone that first understand the error and then look into issues. I removed my desktop files, which were referenced in the project, and therefore compile error occurred.