How can I solve "These relative modules were not found:" problem on a Vue app deploying on netlify?

Question

I am trying to deploy my app to netlify but my build fails... Why?

My main.js file looks like that and if I run locally yarn build then I see no errors, only in netlify!

import Vue from 'vue'
import './plugins/axios'
import App from './App.vue'
import vuetify from './plugins/vuetify'
import router from './router'
import store from './store'

Vue.config.productionTip = false

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

11:51:28 PM:  ERROR  Failed to compile with 4 errors8:51:28 PM
11:51:28 PM: These relative modules were not found:
11:51:28 PM: * ./plugins/axios in ./src/main.js
11:51:28 PM: * ./plugins/vuetify in ./src/main.js
11:51:28 PM: * ./router/index in ./src/main.js
11:51:28 PM: * ./store/index in ./src/main.js
11:51:28 PM:  ERROR  Build failed with errors.
11:51:28 PM: ​
11:51:28 PM: ────────────────────────────────────────────────────────────────
11:51:28 PM:   "build.command" failed                                        
11:51:28 PM: ────────────────────────────────────────────────────────────────
11:51:28 PM: ​
11:51:28 PM:   Error message
11:51:28 PM:   Command failed with exit code 1: npm run build (https://ntl.fyi/exit-code-1)
11:51:28 PM: ​
11:51:28 PM:   Error location
11:51:28 PM:   In Build command from Netlify app:
11:51:28 PM:   npm run build
11:51:28 PM: ​
11:51:28 PM:   Resolved config
11:51:28 PM:   build: