Fails on Mac with no helpful error message

[Mark Ingamells]

Running on a MacBook, I get the following error:

? Enter the copyright header content › Waiting for editor...node:internal/process/promises:289
            triggerUncaughtException(err, true /* fromPromise */);
            ^

[UnhandledPromiseRejection: This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). The promise rejected with the reason "1".] {
  code: 'ERR_UNHANDLED_REJECTION'
}

Not that helpful to me. May be of use to the developers. No clue as to why it was unable to open an editor, or how I should set a default one!