Umbrella header 'TrueTime.h' not found

[Lennartbrugger]

Hey. I got this weird issues testing the demo iOS application

Issue in Script:

framework module TrueTime {
  umbrella header "TrueTime.h"         //  *Umbrella header 'TrueTime.h' not found*

  export *
  module * { export * }
}

module TrueTime.__Swift {
    exclude header "TrueTime-Swift.h"
}

Compiler error:

umbrella header 'TrueTime.h' not found
  umbrella header "TrueTime.h"
                  ^
<unknown>:0: error: could not build Objective-C module 'TrueTime'

Does anyone know how to get rid of the error?