Cannot find a differ supporting object '[object Object]' of type 'object'. NgFor only supports...

I looked at similar questions, but none of them helped me. I am going to receive an object like the following:

[
{
"id": 1,
"name": "Safa",
"email": "neerupeeru@mail.ee",
"purpose": "thesis",
"programme": "Software Engineering",
"year": 2016,
"language": "Estonian",
"comments": "In need of correcting a dangling participle.",
"status": "RECEIVED"
},
{
"id": 2,
"name": "Safa",
"email": "neerupeeru@mail.ee",
"purpose": "thesis",
"programme": "Software Engineering",
"year": 2016,
"language": "Estonian",
"comments": "In need of correcting a dangling participle.",
"status": "RECEIVED"
},
{
"id": 3,
"name": "Salman",
"email": "neerupeeru@mail.ee",
"purpose": "thesis",
"programme": "Software Engineering",
"year": 2016,
"language": "Estonian",
"comments": "In need of correcting a dangling participle.",
"status": "RECEIVED"
}
]


and here is my http service to receive it:

getRequest(){
return this._http.get("http://consultationwebserver.herokuapp.com/requests").map(res => res.json());
}


and finally, in the i called the service in this way:

requests;
constructor(private _http:requestService){}
ngOnInit(){
this.requests=this._http.getRequest().subscribe(res=>this.requests=res);
}


Unfortunately, when the page loads it complains with:

Cannot find a differ supporting object '[object Object]' of type 'object'. NgFor only supports binding to Iterables such as Arrays.


So, what is going wrong with this code?

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