NullInjectorError:没有RouterStateSerializer提供程序

import { RouterStateSerializer } from '@angular/router';
import { RouterStateSnapshot, Params } from '@angular/router';

export interface RouterStateUrl {
  url: string;
  params: Params;
  queryParams: Params;
}

export class CustomSerializer implements RouterStateSerializer<RouterStateUrl> {
  serialize(routerState: RouterStateSnapshot): RouterStateUrl {
    let route = routerState.root;

    while (route.firstChild) {
      route = route.firstChild;
    }

    const { url, root: { queryParams } } = routerState;
    const { params } = route;

    return { url, params, queryParams };
  }
}

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { RouterModule } from '@angular/router';
import { AppComponent } from './app.component';
import { AppRoutingModule } from './app-routing.module';
import { CustomSerializer } from './custom-serializer';

@NgModule({
  imports: [
    BrowserModule,
    RouterModule,
    AppRoutingModule,
    // 其他模块
  ],
  declarations: [AppComponent],
  providers: [
    {
      provide: RouterStateSerializer,
      useClass: CustomSerializer,
    },
    // 其他提供程序
  ],
  bootstrap: [AppComponent],
})
export class AppModule {}