How to solved "Observable.share is not a function" Angular 2 : 
I use cache structure in ionic 2. I define an observable array. I record the data that is returned from the server here. But every time this shape gives me a mistake. How do I solve it?

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     marketArray : Observable<any>; /* GLOBAL */   this.http.get(this.base_url,header).map(res=>res.json()).subscribe(data=>{
          loader.dismissAll();
          this.marketArray = this.cache.loadFromObservable(this.base_url, data["Table"]);
          
        }, (error)=>{
          loader.dismissAll();
          this.marketler();
        });

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