title: node_modules/ag-grid/main"' has no exported member 'IHeaderGroup'
body: <p>I'm quiet new to angular 4 &amp; trying to use ag-grid from here <a href="https://www.ag-grid.com/ag-grid-angular-angularcli/#gsc.tab=0" rel="nofollow noreferrer">https://www.ag-grid.com/ag-grid-angular-angularcli/#gsc.tab=0</a>.</p>
  
  <p>I keep getting errors like below and I couldn't find any links that were helpful:</p>
  
  <blockquote>
    <p>node_modules/ag-grid-angular/dist/interfaces.d.ts (1,10): Module
    '"C:/Use rs/shm/A4/first-app/node_modules/ag-grid/main"' has no
    exported member 'IHeaderGroup'.</p>
    
    <p>node_modules/ag-grid-angular/dist/interfaces.d.ts (1,24): Module
    '"C:/Use rs/shm/A4/first-app/node_modules/ag-grid/main"' has no
    exported member 'IHeaderGroupParams'.</p>
    
    <p>ag-grid-angular/dist/interfaces.d.ts (1,44): Module '"C:/Use
    rs/shm/A4/first-app/node_modules/ag-grid/main"' has no exported member
    'IHeader'.</p>
  </blockquote>
  
  <pre><code>//app.module.ts
  import {AgGridModule} from 'ag-grid-angular';
  import { RedComponentComponent } from './red-component/red-component.component';
  import { MyAgGridComponent } from './my-ag-grid/my-ag-grid.component';
  
          @NgModule({
            declarations: [
              AppComponent,
              SpinnerComponent,
              RedComponentComponent,
              MyAgGridComponent,
            ],
            imports: [
              BrowserModule,
              HttpClientModule, HttpModule,
              FormsModule,
              BrowserAnimationsModule,
              MdButtonModule,
              MdProgressSpinnerModule,
              MdInputModule,
              AgGridModule.withComponents([RedComponentComponent]),
            ],
            exports: [SpinnerComponent],
            providers: [],
            bootstrap: [AppComponent]
          })
          export class AppModule {}
  </code></pre>
  
  <p>package.json</p>
  
  <pre><code>"ag-grid-angular": "^12.0.0",
      "ag-grid-ng2": "^8.0.0",
      "core-js": "^2.4.1",
      "rxjs": "^5.1.0",
  </code></pre>
  
  <p>Can anyone help me figure out a solution for this?</p>