錯誤消息：

main.ts:12 NullInjectorError: R3InjectorError(AppModule)[StoreFeatureModule -> ReducerManager -> ReducerManager -> ReducerManager]:
NullInjectorError: No provider for ReducerManager!
at NullInjector.get (http://localhost:4200/vendor.js:8310:27)
at R3Injector.get (http://localhost:4200/vendor.js:22317:33)
at R3Injector.get (http://localhost:4200/vendor.js:22317:33)
at R3Injector.get (http://localhost:4200/vendor.js:22317:33)
at injectInjectorOnly (http://localhost:4200/vendor.js:8165:33)
at Module.??inject (http://localhost:4200/vendor.js:8175:57)
at Object.StoreFeatureModule_Factory [as factory] (http://localhost:4200/vendor.js:64143:380)
at R3Injector.hydrate (http://localhost:4200/vendor.js:22555:63)
at R3Injector.get (http://localhost:4200/vendor.js:22305:33)
at http://localhost:4200/vendor.js:22351:25

根據這篇文章的提示：
https://www.manongdao.com/article-974354.html

StoreModule.forRoot should only be called once in the root of your project NgModule. If you wan’t to register a feature, use StoreModule.forFeature. Using forRoot registers the global providers needed for Store.

在app module里添加一行代碼即可解決：

StoreModule.forRoot({})

總結

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