Hi GLMSDev,
The variable this.grid is undefined, when you try to use it. This basically means that your app.component.html template reference #grid or something else which you use is not bound to a ViewChild in your app.component.ts or the moment when you try to refer to that variable is before the Angular view is initialized. My suggestion would be to take a look and get started from: https://www.htmlelements.com/docs/grid/#angular.
Best regards,
Peter Stoev
Smart UI Team
https://www.htmlelements.com/