vue 插件提示错误：[vuex] unknown mutation type: addItem

Question

Add.vue: <template>   <div>       <p>标题</p>       <input type="text" v-model="title"></input>       <p>新闻内容</p>       <input type="text" v-model="content"></input>     <p><button type="buttom" @click="add()">提交</button></p>     </div>     </template>     <script>         import store from "../../../travel/src/store";     export default {         name: "add.vue",         store:store,         data(){             return{                 title:'',                 content:''             }         },         methods:{             add(){                 store.commit('addItem',{                     title: this.title,                     content: this.content                 })             }         }     } </script> <style scoped> </style> store.vue: import Vue from 'vue'; import Vuex from 'vuex'; Vue.use(Vuex); export default new Vuex.Store({   state: {     lists:[]   },   mutations: {     addItem (state, value) {         state.lists.push(value)     }   },   actions: {   }, });