vuex is not defined

If you are getting an error message saying "vuex is not defined", it means that Vuex is not properly installed or imported in your project. Here are a few things you can check:

1. Make sure you have installed Vuex in your project using npm or yarn. You can do this by running the command "npm install vuex" or "yarn add vuex" in your terminal.

2. Make sure you are importing Vuex in your project. If you are using Vue CLI, you can import it in your main.js file like this:

import Vue from 'vue'
import Vuex from 'vuex'
import App from './App.vue'

Vue.use(Vuex)

const store = new Vuex.Store({
  // your store options
})

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

3. If you are still getting the error, try restarting your development server and/or deleting your node_modules folder and reinstalling all dependencies.