@classmethod
def on_mapping_not_found(cls, controller):
    """
    Callback function that is triggered, when the mapping of a controller was not found

    :param controller:              the controller that should be mapped
    :type controller:               steuer.Controller
    """
    print('EVENT:' +
        'controller {0}:{1} could not be mapped. Controller name unknown.'.
        format(controller.number, controller.name))
