Target class [Controller] does not exist.

PHP
//add controller path
Route::get('/players', 'App\Http\Controllers\PlayerController@index');//accessing any function in the controller (this is web.php file)
use App\Http\Controllers\PostsController;

Route::get('/post', 'App\Http\Controllers\PostsController@index');Route::get('/users', [UserController::class, 'index']);//In laravel 8 uncomment  protected $namespace='App\\Http\\Controllers';
Source

Also in PHP: