ExpressionChangedAfterItHasBeenCheckedError: Expression has changed after it was checked. Previous value: 'ngIf: [object Object]'. Current value: 'ngIf: true'.
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ExpressionChangedAfterItHasBeenCheckedError: Expression has changed after it was checked. Previous value: 'ngIf: [object Object]'. Current value: 'ngIf: true'.

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// This type of error usually shows up beyond the initial development 
// stages, when we start to have some more expressions in our 
// templates, and we have typically started to use some of the 
// lifecycle hooks like AfterViewInit.
// below is the quick fix or workaround.

import { ChangeDetectorRef,AfterContentChecked} from '@angular/core'

export class example implements OnInit, AfterContentChecked {
    ngAfterContentChecked() : void {
        this.changeDetector.detectChanges();
    }
}

// for more detail about this type of error visit : 
// https://blog.angular-university.io/angular-debugging/