пишет что notificationService.getNotificationSettings  это не функция

Router
------------------------------

router.get("/settings",JWTMiddleware, function (req, res, next){
    res.setHeader("Content-Type", "application/json");
    notificationService.getNotificationSettings(req.userId).then(            <---------------- ошибка здесь
        model => {
            req.data = model;
            next();
        },
        error => {
            req.data.success = false;
            req.data.info = error;
            next();
        });
});


Service
------------------------------

const getNotificationSettings = async (userId) => {
    return notificationSettingsModel.findAll(
    {
        where:{id:userId}
    }).then(model => {return model;}).catch(error => {throw error});
};