cannot read property 'subscribe' of undefined in Angular

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cannot read property 'subscribe' of undefined in Angular

You will get this error when you initialize the subject as below.

public tokenAcquired: Subject<any>;
and calling subscribe method over it as below.
this.appService.tokenAcquired.subscribe((token) => {
      this.getApps();
    })
Solution - To fix this error declare and initialize the subject as below.

public tokenAcquired: Subject<any> = new Subject<any>();

Thanks

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