ypeError: Cannot read property '_t' of undefined - laravel

I'm using laravel + vue to build my site, I'm using vue18n for localization.
my app.js file is:
require('./bootstrap');
window.Vue = require('vue');
import Vue from 'vue';
import App from './components/App.vue';
import VueAxios from 'vue-axios';
import VueRouter from 'vue-router';
import axios from 'axios';
import { routes } from './routes';
import VueI18n from 'vue-i18n';
import "bootstrap";
import "bootstrap/dist/css/bootstrap.min.css";
Vue.use(VueI18n);
Vue.use(VueRouter);
Vue.use(VueAxios, axios);
const router = new VueRouter({
mode: 'history',
routes: routes
});
const app = new Vue({
el: '#app',
router: router,
render: h => h(App),
});
in my newarticle.vue:
<p>{{$t('message')}}</p>
and I created a folder (locales) , in this folder I have two files (en.json) and (ar.json).
but this problem appear:
TypeError: Cannot read property '_t' of undefined
at Proxy.Vue.$t (app.js:37834)
at Proxy.render (app.js:40051)
at VueComponent.Vue._render (app.js:47261)
at VueComponent.updateComponent (app.js:47779)
at Watcher.get (app.js:48192)
at new Watcher (app.js:48181)
at mountComponent (app.js:47786)
at VueComponent.Vue.$mount (app.js:52763)
at VueComponent.Vue.$mount (app.js:55672)
at init (app.js:46834)
can you help me, please

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