@Inject(Http) public _http: Http

EXCEPTION: Cannot resolve all parameters for 'HttpRest'(Http @Inject(Http), undefined @Inject(undefined)). Make sure that all the parameters are decorated with Inject or have valid type annotations and that 'HttpRest' is decorated with Injectable.

@Injectable()
export class UserIds{
   private _signature_id:string;
   private _role_id:number;
   get signature_id():string{
      return this._signature_id;
   }
   set signature_id(id:string){
      this._signature_id = id;
   }
   get role_id():number{
      return this._role_id;
   }
   set role_id(id:number){
      this._role_id = id;
   }
}

@Injectable()
export class HttpRest{
    groups;
    constructor(
        @Inject(Http) public _http: Http,
        @Inject(UserIds) public _ids: UserIds
    ){}
...
}

,
@Inject(UserIds) public _ids: UserIds