验证给定错误Uncaught ReferenceError：未定义过程

Question

我尝试使用vuelidate https://vuelidate.netlify.com/#sub-installation从输入表单中进行输入验证，但在控制台中给出了错误。我正在使用Vue.JS和Axios进行表单输入，需要您的帮助，我可能会错过一些东西。

这是输入表单的代码

  <div class="form-group" :class="{ 'form-group--error': $v.nopolisi.$error }">
<input type="text" class="form-control" v-model.trim="nopolisi" @input="setnopolisi($event.target.value)" name="nopolisi" id="nopolisi"/>
    <div class="error" v-if="!$v.nopolisi.required">Field is required</div>
    <div class="error" v-if="!$v.nopolisi.minLength">No Polisi must have at least {{$v.nopolisi.$params.minLength.min}} letters.</div>

</div>

这是Javascript的代码

import API from '../API';
import swal from 'sweetalert';
import Vuelidate from 'vuelidate'
Vue.use(Vuelidate)
import { required, minLength } from 'vuelidate/lib/validators'

var urlAddStock = API.url.host + '/addstock';

var inputMobile = {
    init: function(){
        this.vueConfig();
        API.auth();
    },
    vueConfig: function(){
        var app = new Vue({
            el: '#app',
            data() {
                return{
                          nopolisi: ""
                      }
                  },
           validations: {
                nopolisi: {
                  required,
                  minLength: minLength(4)
                },
            },
           methods: {
                submitStock: function(){
                    let self = this;
                    this.stockSubmit = true;
                    axios({
                             nopolisi: this.nopolisi
                      }).then(res =>{
                        console.log(res.data.message);
                        if(res.data.message === "Berhasil Menambahkan Data")
                        {

                            swal({
                                title: "Sukses!",
                                text: "Sukses Manambahkan Data",
                                icon: "success",
                                button: "OK",
                              });

                            self.stockSubmit = false;
                        } 
                        else 
                        {
                            swal({
                                title: "Terjadi Kesalahan System",
                                text: res.data.message,
                                icon: "error",
                              });
                            self.stockSubmit = false;
                        }

                    }, err =>{
                        console.log(err);
                        self.stockSubmit = false;
                    });
                 },
                 setnopolisi: function(value) {
                    this.nopolisi = value
                    this.$v.nopolisi.$touch()
                  },
             },


        });
    }
}

感谢您的任何回复