Why doesn't Vue flip the store?

Question

Vue.js

Hello everyone, I've run into the following problem. When the store is initialized in the main component, it is visible, but not in the child ones, what am I doing wrong?
Point of entry:

import Vue from 'vue/dist/vue'
import { store } from './store/index';

import PopupWrapper from './components/PopupWrapper/PopupWrapper.vue'
import PopupCallback from './components/PopupCallback/PopupCallback.vue'

new Vue ({
  store,
  el: '#app',
  components: {
    PopupWrapper, PopupCallback,
  }
})

Storage file:

import Vue from 'vue/dist/vue';
import Vuex from 'vuex';

Vue.use(Vuex);

import { PopupWrapper } from '../components/PopupWrapper/PopupWrapper.store'
import { PopupCallback } from '../components/PopupCallback/PopupCallback.store'

export const store = new Vuex.Store({
  modules: {
    PopupWrapper,
    PopupCallback
  }
});

Answer 1

Add to entry point:

import Vuex from 'vuex';
Vue.use(Vuex);

And remove from the store:
Vue.use(Vuex);