I started seeing this a few weeks ago with Xcode beta, but now that I have upgraded Xcode from the App Store I can’t build apps at all. I use Xcode 9.4 and RubyMotion 5.8. MacOS 10.13.4.
Ah never mind the upgrade fixed it, just in time. RubyMotion rocks!
I’m on it
Lemme know if you hit any snags!
I was able to fix this for my build by uncommenting the line that specifies the version number in the Rakefile and changing it to the latest version.