I want to delete the error "GET http: // localhost: 4200 / assets / i18n / 1 / fr.json 404 (Not Found)" in the console @ Angular

I want to avoid the error "GET http: // localhost: 4200 / assets / i18n / 1 / fr.json 404 (Not Found)" in the console and in the network of navigator in Angular
//custom.translate.loader.ts******

        return Observable.create(observer => {
            this.http.get('./assets/i18n/' + loggedUser.selectedOrganizationId + '/' + lang + 
            '.json').subscribe((res: Response) => {
                observer.next(res);
                observer.complete();
            },
                error => {
                    this.http.get('/assets/i18n/default/' + lang + '.json').subscribe((res: Response) 
                      => {
                        observer.next(res);
                        observer.complete();
                    })

                }
            );
        });

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Source Url I want to delete the error "GET http: // localhost: 4200 / assets / i18n / 1 / fr.json 404 (Not Found)" in the console @ Angular