[AngularJS] I cannot post data to back end from angular6

[chinelookolo28]

Am trying to post data to php backend and display json call  response 
message *success* but am having the following errors


*Error in src/app/car.service.ts(42,5): error type*
*observable<Object> is not assignable to type Observable<String>*

Here is *app.component.ts* code

import { Component, OnInit } from '@angular/core';

import { Car } from './car';
import { CarService } from './car.service';
   



@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent implements OnInit {


  //cars: Car[];


cars: Car="";



  error = '';
  success = '';

car = new Car('', 0);

  constructor(private carService: CarService) {
  }


  ngOnInit() {
    //this.getCars();
  }


public regCar(r) {
          this.resetErrors();
          this.carService.store1(this.car)
            .subscribe(
              res => {
                alert(res);

                if (res === 'success') { // or this.cars['message']
                    // Inform the user
                    this.success = 'Created successfully';
                }

                // Reset the form
                r.reset();
              },
              err => this.error = err
            );
    }

  private resetErrors(){
    this.success = '';
    this.error   = '';
  }

}


Here is the *Car.services.ts*
import { Injectable } from '@angular/core';
import { HttpClient, HttpErrorResponse, HttpParams } from 
'@angular/common/http';

import { Observable, throwError } from 'rxjs';
import { map, catchError } from 'rxjs/operators';

import { Car } from './car';


@Injectable({
  providedIn: 'root'
})
export class CarService {

baseUrl = 'http://localhost/angular-project1/api';


//cars: ;

//cars: Car[];

constructor(private http: HttpClient) { }

  store1(car: Car): Observable<String> {
    return this.http.post(`${this.baseUrl}/store1`, { data: car })
      .pipe(
      catchError(this.handleError));
  }

  private handleError(error: HttpErrorResponse) {
    console.log(error);

    // return an observable with a user friendly message
    return throwError('Error! something went wrong.');
  }
}



here is the* car.ts*




*export class Car {  constructor(    model: string,    price: number,    
id?:   number) {}}store.php*


*// pass parameter here*
*$car = [*
*      'message' => 'success'*
*    ];*
 
*    echo json_encode($car);*
*  }*
*  else*
*  {*
*    http_response_code(422);*
*  }*







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