我最近从 Webpack 2 升级到 4。Webpack 编译，并且大部分应用程序运行良好。它似乎是应用程序的损坏部分。我收到错误
NullInjectorError: No provider for InjectionToken config!
我的module.ts文件如下
NullInjectorError: No provider for InjectionToken config!
完整的错误信息是
import { enableProdMode, Inject, Injector, ErrorHandler } from '@angular/core';
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { AppComponent } from './app.component';
import { WsBootstrapService } from '../services/bootstrap';
import { WsBrandTypesService } from '../services/brandTypes';
import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { RouterModule, UrlHandlingStrategy, UrlTree } from '@angular/router';
import { FormsModule } from '@angular/forms';
import …