I am trying to use the npm package in angular Ng-Multiselect-Dropdown, I have it installed and all the code in places however when I try to access the page it does not load and the following error is showing:

See code below:

HTML:

  <ng-multiselect-dropdown [placeholder]="'custom placeholder'"
                         [settings]="dropdownSettings"
                         [data]="dropdownList"
                         [(ngModel)]="selectedItems"
                         (onSelect)="onItemSelect($event)"
                         (onSelectAll)="onSelectAll($event)">
</ng-multiselect-dropdown>

Typescript:

AppsModule: