Angular5 – TypeError: Cannot read property ‘template’ of undefined

I forgot to define the header cell for the actions. So it was throwing that error. Here is the code which solved this problem.

<ng-container matColumnDef="actions">
  <mat-header-cell *matHeaderCellDef></mat-header-cell>
  <mat-cell *matCellDef="let row">
    <button mat-button (click)="showDetails(row)">DETAILS</button>
    <button mat-button (click)="editItem(row)">EDIT</button>
    <button mat-button (click)="deleteItem(row)">DELETE</button>
  </mat-cell>
</ng-container>

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Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)