Same code, can not solve this error, is the project to old for this year?

[savabezanovic]

Fatal error: Uncaught Error: Class 'App\Core\App' not found in D:\laragon\www\InternshipTest\core\bootstrap.php:6 Stack trace: #0 D:\laragon\www\InternshipTest\index.php(4): require() #1 {main} thrown in D:\laragon\www\InternshipTest\core\bootstrap.php on line 6