Uncaught error: Class 'Config\App' not found

i want to serve my codeigniter project but the error appears that says "Uncaught error: Class 'Config\App' not found in D:\myfolder\myproject\vendor\codeigniter4\framework\system\Config\Factories.php" and much more directory, pls help me i just want to learn php, but why every time i want to make a php project, there always comes an error that cannot be answered