Hello,
with the latest Xcode 11.0 I get this error when I try to compile a Codea Project:
module compiled with Swift 5.0 cannot be imported by the Swift 5.1 compiler
complaining about this module:
Frameworks/RuntimeKit.framework/Modules/RuntimeKit.swiftmodule/x86_64.swiftmodule
Maybe you would have to compile the runtime with the latest XCode?
As a workaround I will try to install an older Xcode version on my notebook.