角度：HttpClientModule导入错误（无法解析为NgModule类）

我试图在伪造的json服务器上使用crud构建一个简单的应用程序

但我不能导入HttpClientModule

这是来自VS Code的错误消息：

ERROR in node_modules/@angular/common/http/http.d.ts:2801:22 - error NG6002: Appears in the NgModule.imports of AppModule, but could not be resolved to an NgModule class.

    This likely means that the library (@angular/common/http) which declares HttpClientModule has not been processed correctly by ngcc, or is not compatible with Angular Ivy. Check if a newer version of the library is available, and update if so. Also consider checking with the library's authors to see if the library is expected to be compatible with Ivy.

    2801 export declare class HttpClientModule {

这是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 { EmployeeCreateComponent } from './employee-create/employee-create.component';
import { EmployeeEditComponent } from './employee-edit/employee-edit.component';
import { EmployeeListComponent } from './employee-list/employee-list.component';

import { HttpClientModule } from '@angular/common/http';


@NgModule({
  declarations: [
    AppComponent,
    EmployeeCreateComponent,
    EmployeeEditComponent,
    EmployeeListComponent
  ],
  imports: [
    BrowserModule,
    HttpClientModule,
    AppRoutingModule
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

app.component.ts

import { Component } from '@angular/core';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent {
  title = 'restTest6';
}

请注意：我没有在其他任何地方使用HttpClientModule。我导入并做ng serve -o了错误。请指出出了什么问题