我正在使用Vue3和Vuex4，但是一直出现以下错误：

Uncaught TypeError: Cannot read properties of undefined (reading 'state') at ReactiveEffect.eval [as fn] (App.vue?3dfd:36) at ReactiveEffect.run (reactivity.esm-bundler.js?a1e9:160) at ComputedRefImpl.get value [as value] (reactivity.esm-bundler.js?a1e9:1087) at setup (App.vue?3dfd:37) at callWithErrorHandling (runtime-core.esm-bundler.js?5c40:6656) at setupStatefulComponent (runtime-core.esm-bundler.js?5c40:6272) at setupComponent (runtime-core.esm-bundler.js?5c40:6228) at mountComponent (runtime-core.esm-bundler.js?5c40:4081) at processComponent (runtime-core.esm-bundler.js?5c40:4056) at patch (runtime-core.esm-bundler.js?5c40:3651)

我想将“hello”设置为message变量，以便在整个应用程序中使用，这是我的main.js文件：

import { createApp} from 'vue' import App from './App.vue' import router from './router' import { createStore } from 'vuex'; const store = createStore({ state(){ return{ message: 'hello' } } }) createApp(App).use(router, store).mount('#app')

这是我的App.vue文件，我正在尝试使用计算函数和组合式API接收它。

import { ref, computed } from 'vue' import { useStore } from 'vuex' export default { name: 'App', setup(){ const store = useStore(); const message = computed(() => store.state.message); console.log(message.value); return{ } } }