Angualr 9无法导入NGXS模块

Question

我正在尝试学习NGXS，我已经使用npm安装了它。

app.module.ts

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';

import { AppRoutingModule } from './app-routing.module';
import { AppComponent } from './app.component';
import {NgxsModule} from '@ngxs/store';
import {environment} from '../environments/environment';

    @NgModule({
      declarations: [
        AppComponent
      ],
      imports: [
        BrowserModule,
        AppRoutingModule,
        NgxsModule.forRoot([], {
          developmentMode: !environment.production
        })
      ],
      providers: [],
      bootstrap: [AppComponent]
    })
    export class AppModule { }

但是正在给出错误Class NgxsRootModule is not an Angular module。

  "dependencies": {
    "@angular/animations": "~9.1.11",
    "@angular/common": "~9.1.11",
    "@angular/compiler": "~9.1.11",
    "@angular/core": "~9.1.11",
    "@angular/forms": "~9.1.11",
    "@angular/platform-browser": "~9.1.11",
    "@angular/platform-browser-dynamic": "~9.1.11",
    "@angular/router": "~9.1.11",
    "@ngxs/devtools-plugin": "^3.6.2",
    "@ngxs/logger-plugin": "^3.6.2",
    "@ngxs/store": "^3.6.2",
    "rxjs": "~6.5.4",
    "tslib": "^1.10.0",
    "zone.js": "~0.10.2"
  }

请帮助。