code: function appError(display) {
      if (display.output) {
        jitsu.log.error('Error output from application. This is usually a user error.');
        display.output.split('\n').forEach(function (line) {
          jitsu.log.error(line);
        })
      }
  
      return !display.solenoid
        ? unknownError(display.message, display.stack)
        : solenoidError(display);
    }
docs: ### function appError(display) Displays an "application" error.