angular-ng-class

What is wrong with my Angular code? I am getting the following error: Cannot read property ‘remove’ of undefined at BrowserDomAdapter.removeClass <ol> <li *ngClass=”{active: step===’step1′}” (click)=”step=’step1′”>Step1</li> <li *ngClass=”{active: step===’step2′}” (click)=”step=’step2′”>Step2</li> <li *ngClass=”{active: step===’step3′}” (click)=”step=’step3′”>Step3</li> </ol> 22 s 22 Angular version 2+ provides several ways to add classes conditionally: type one [class.my_class] = “step === ‘step1′” … Read more