Command CompileSwift failed with a nonzero exit code in Xcode 10

I attempted

  • Closing & Reopening Xcode
  • Cleaning Build Folder
  • Running pod install --repo-update

and all of these still did not fix the problem.

Restarting the Mac did the trick!


For me, just cleaning project works using ShiftCommandK & OptionShiftCommandK.


You're most likely not reading the entire error message. If you look above the "Command CompileSwift failed with a nonzero exit code" message you should find some specification like this:

enter image description here

In this example I had two files with the same name. Once I fixed it everything worked as it should.