title: Uncaught Error: Template parse errors: Can't bind to 'dataSource' since it isn't a known property of 'table'
body: <p>hello when am trying to add the material data table i found this error : 
  Uncaught Error: Template parse errors:
  Can't bind to 'dataSource' since it isn't a known property of 'table'.</p>
  
  <pre><code> - my material version : "@angular/material": "^6.2.1"
   - my angular version : "@angular/core": "^6.0.5",
  </code></pre>
  
  <blockquote>
    <p>here is my module.ts</p>
  </blockquote>
  
  <pre><code>import {BrowserAnimationsModule} from '@angular/platform-browser/animations';
  import {MatButtonModule, MatCheckboxModule} from '@angular/material';
  import { MatTableModule , MatSortModule } from "@angular/material";
  </code></pre>
  
  <blockquote>
    <p>here is my component.ts file</p>
  </blockquote>
  
  <pre><code>import {Component, OnInit, ViewChild} from '@angular/core';
  import {MatSort, MatTableDataSource} from '@angular/material';
  
  @Component({
    selector: 'app-government-index',
    templateUrl: './government-index.component.html',
    styleUrls: ['./government-index.component.scss']
  })
  export class GovernmentIndexComponent implements OnInit {
    displayedColumns = ['position', 'name', 'weight', 'symbol'];
    dataSource = new MatTableDataSource(ELEMENT_DATA);
  
    @ViewChild(MatSort) sort: MatSort;
  
    ngOnInit() {
      this.dataSource.sort = this.sort;
    }
  }
  
  export interface PeriodicElement {
    name: string;
    position: number;
    weight: number;
    symbol: string;
  }
  
  const ELEMENT_DATA: PeriodicElement[] = [
    {position: 1, name: 'Hydrogen', weight: 1.0079, symbol: 'H'},
    {position: 2, name: 'Helium', weight: 4.0026, symbol: 'He'},
    {position: 3, name: 'Lithium', weight: 6.941, symbol: 'Li'},
    {position: 4, name: 'Beryllium', weight: 9.0122, symbol: 'Be'},
    {position: 5, name: 'Boron', weight: 10.811, symbol: 'B'},
    {position: 6, name: 'Carbon', weight: 12.0107, symbol: 'C'},
    {position: 7, name: 'Nitrogen', weight: 14.0067, symbol: 'N'},
    {position: 8, name: 'Oxygen', weight: 15.9994, symbol: 'O'},
    {position: 9, name: 'Fluorine', weight: 18.9984, symbol: 'F'},
    {position: 10, name: 'Neon', weight: 20.1797, symbol: 'Ne'},
  ];
  </code></pre>
  
  <p>here is the link that am trying to follow : <a href="https://material.angular.io/components/table/overview" rel="nofollow noreferrer">https://material.angular.io/components/table/overview</a></p>