Laravel Exception could not find driver SQ limit 1

i was learning laravel6 from scratch from laracast.com and when i started to use the database. I bumped into the following problem:

Illuminate\Database\QueryException could not find driver (SQL: select * from posts where slug = my-first-post limit 1)

I use wamp with phpmyadmin. I tried xamp and mySQL workbench. I updated my dependencies, but without result.

this is my controller:

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;

class PostsController extends Controller
{
    public function show($slug)
    {
        $post = \DB::table('posts')->where('slug', $slug)->first();

        if(! $post){
            abort(404);
        }

     return view('post', [
         'post' => $post
     ]);
    }
}

Can somebody please help me with this problem?

Best regards, Jeff