AXE on Angular 7+

When using AXE (accessibility), I receive this error:

Here is my code:

<div class="table-style">
    <table mat-table class="mat-elevation-z8 table-format">
       <ng-container matColumnDef="item">
          <th class="info--header" mat-header-cell *matHeaderCellDef>Something</th>
          <td class="info-header2" mat-footer-cell *matFooterCellDef>
              <p>Hello</p>
          </td>
       </ng-container>
       <tr mat-header-row *matHeaderRowDef="displayedColumns"></tr>
       <tr mat-footer-row *matFooterRowDef="displayedColumns"></tr>
    </table>
</div>