无法绑定到'ngForFor'，因为它不是'li'的已知属性

My app.module

我的app.module

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { FormsModule } from '@angular/forms';
import { HttpModule } from '@angular/http';

import { AppComponent } from './app.component';
import { routing, appRoutingProviders} from './app.routing'
import { ProductSearchModule} from './productSearch/productSearch.module'

@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    BrowserModule,
    FormsModule,
    HttpModule,
    routing,
    ProductSearchModule
  ],
  providers: [appRoutingProviders],
  bootstrap: [AppComponent]
})
export class AppModule { }
import { Browser