I've seen that error when `elm-lang/core` is missing from the dependencies in elm-package.json.
Try `elm package install elm-lang/core`. -- You received this message because you are subscribed to the Google Groups "Elm Discuss" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
