Vue.js use method of undefined

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Currently I am working with Vue CLI version ^3.0.0 and Vuex ^3.6.0, but when I want to use Vue.use(Vuex).
It says in the browser cannot read use of undefined.

Code:

main.js

import App from './App.vue'
import store from './store'

new Vue({
    store,
    render: h => h(App)
}).$mount('#app')

Store.js:

import Vue from 'vue';
import Vuex from 'Vuex';

Vue.use(Vuex);

export default Vuex.Store({
    state: {
        count: 0
    },
    mutations: {
        increment(state) {
            state.count++
        }
    }
})

enter image description here

Error received:

Uncaught TypeError: Cannot read property ‘use’ of undefined

Do you guys have any idea?

Thanks in advance.

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