Value must be an array in multiple-selection mode in angular material mat-select

I am using angular material mat-select component.

<mat-table [dataSource]="dataSource" class="mat-elevation-z8" matSort >

<ng-container matColumnDef="sensitive">
<mat-header-cell class="table-header header-p" *matHeaderCellDef> <b>sensitive</b> </mat-header-cell>
<mat-cell class="table-content context-position " *matCellDef="let element" >
<mat-select placeholder="sensitive" multiple [(ngModel)]="element.sensitive" >
<mat-option *ngFor="let type of sensitiveList" [value]="type">{{type}}</mat-option>
</mat-select>
</mat-cell>
</ng-container>

<mat-header-row class="table-header-row" *matHeaderRowDef="displayedColumns"></mat-header-row>
<mat-row [ngClass]="((i%2) == 1) ? 'table-content-row-single' : 'table-content-row-double'" *matRowDef="let row; columns: displayedColumns;"></mat-row>
</mat-table>


typescript sensitiveList : string[] = [ 'none', 'sensitive']; for(var i=0;i
why running the code gives me an error

Value must be an array in multiple-selection mode

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