javascript - Angular: conditional class with *ngClass

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#short
#javascript
#css
#angular
#angular-template
#angular-ng-class
What is wrong with my Angular code? I am getting the following error:

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
  1. Code Samples
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