title: ngZorro - StaticInjectorError(AppModule)[Overlay]
body: <p>Im using ng-zorro for my project, i get the following error after --prod.
  Normally doing server does not produces this error.
  I found out this git post <a href="https://github.com/NG-ZORRO/ng-zorro-antd/issues/3713#issuecomment-513933229" rel="nofollow noreferrer">https://github.com/NG-ZORRO/ng-zorro-antd/issues/3713#issuecomment-513933229</a>
  but didn`t work out for me.</p>
  
  <pre><code>main-es2015.fa929b87a49d088ae223.js:36985 ERROR NullInjectorError: StaticInjectorError(AppModule)[Overlay]: 
    StaticInjectorError(Platform: core)[Overlay]: 
      NullInjectorError: No provider for Overlay!
  </code></pre>
  
  <p>My package.json file</p>
  
  <pre><code>{
    "name": "sporttzzmeetup",
    "version": "0.0.0",
    "scripts": {
      "ng": "ng",
      "start": "ng serve",
      "build": "ng build",
      "test": "ng test",
      "lint": "ng lint",
      "e2e": "ng e2e"
    },
    "private": true,
    "dependencies": {
      "@angular/animations": "~8.2.10",
      "@angular/cdk": "~8.2.1",
      "@angular/common": "~8.2.10",
      "@angular/compiler": "~8.2.10",
      "@angular/core": "~8.2.10",
      "@angular/forms": "~8.2.10",
      "@angular/platform-browser": "~8.2.10",
      "@angular/platform-browser-dynamic": "~8.2.10",
      "@angular/router": "~8.2.10",
      "core-js": "^2.5.4",
      "ng-zorro-antd": "^8.3.1",
      "rxjs": "~6.5.3",
      "tslib": "^1.9.0",
      "zone.js": "~0.9.1"
    },
    "devDependencies": {
      "@angular-devkit/build-angular": "~0.803.8",
      "@angular/cli": "~8.3.8",
      "@angular/compiler-cli": "~8.2.10",
      "@angular/language-service": "~8.2.10",
      "@types/jasmine": "~2.8.8",
      "@types/jasminewd2": "~2.0.3",
      "@types/node": "~8.9.4",
      "codelyzer": "^5.0.1",
      "jasmine-core": "~2.99.1",
      "jasmine-spec-reporter": "~4.2.1",
      "karma": "~4.0.0",
      "karma-chrome-launcher": "~2.2.0",
      "karma-coverage-istanbul-reporter": "~2.0.1",
      "karma-jasmine": "~1.1.2",
      "karma-jasmine-html-reporter": "^0.2.2",
      "protractor": "~5.4.0",
      "ts-node": "~7.0.0",
      "tslint": "~5.11.0",
      "typescript": "~3.5.3"
    }
  }
  
  </code></pre>
  
  <hr>
  
  <p>Imports in app.module.ts
  The project works properly with ng server.   </p>
  
  <pre><code>@NgModule({
    declarations: [
      AppComponent,
      CommentsComponent,
    ],
    imports: [
      FlexLayoutModule,
      BrowserModule,
      AppRoutingModule,
      FormsModule,
      ReactiveFormsModule,
      HttpClientModule,
      BrowserAnimationsModule,
      NgZorroAntdModule
    ],
    providers: [
      GlobalService,
      RouteGuardService,
      { provide: HTTP_INTERCEPTORS, useClass: HttpAuthInterceptor, multi: true },
      { provide: NZ_I18N, useValue: en_US }],
    bootstrap: [AppComponent]
  })
  export class AppModule { }
  </code></pre>