Laravel 5.8 Custom validation error 'class does not exist'

I'm am new to laravel and i am trying to get my custom validation rules to work on my controller. It's showing that the class does not exist.

ReflectionException thrown with message "Class App\Http\Controllers\StoreBooksRequest does not exist"

I made the request file using the artisan command.

lando artisan make:request StoreBooksRequest

this is my request file :

namespace App\Http\Requests;

use Illuminate\Foundation\Http\FormRequest;

class StoreBooksRequest extends FormRequest
{
    /**
     * Determine if the user is authorized to make this request.
     *
     * @return bool
     */
    public function authorize()
    {
        return true;
    }

    /**
     * Get the validation rules that apply to the request.
     *
     * @return array
     */
    public function rules()
    {
        return [
            //
            'title' => 'required|unique:books|max:150',
            'description' => 'required',
            'isbn' => 'required|max:20'
        ];
    }
}

and this is the controller where i am trying to get the custom request rules to work :

namespace App\Http\Controllers;

use App\Book;
use Illuminate\Http\Request;

class BooksController extends Controller
{
    /**
     * Display a listing of the resource.
     *
     * @return \Illuminate\Http\Response
     */
    public function index()
    {
        //
        $books = Book::all();

        return view('books.index', compact('books'));
    }

    /**
     * Show the form for creating a new resource.
     *
     * @return \Illuminate\Http\Response
     */
    public function create()
    {
        return view('books.create');
    }

    /**
     * Store a newly created resource in storage.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return \Illuminate\Http\Response
     */
    public function store(StoreBooksRequest $request)
    {
        $book = new Book();

        $book->title = $request->title;
        $book->description = $request->description;
        $book->isbn = $request->isbn;

        $book->save();
    }

I think the problem is with the error saying that the request file is in the Controllers folder and not in the standard Requests folder.

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