ExpressionChangedAfterItHasBeenCheckedError

This suggests this is specifically to do with a ViewChild getting messed up in the AfterViewInit lifecycle hook in an Angular application. It is going to be something like this insofar as you are trying to manipulate a ViewChild that is lacking in some fashion. The first link I provide here suggests it stems from race conditions as many things manipulate the DOM at "once" so to speak.