CI4 Manual Installation

I have copied this to the pdos folder under /htdocs. Running as localhost/pdos works fine. It displays a directory structure, but when I click the public folder, it gives the following error:

Fatal error: Uncaught Error: Call to undefined function CodeIgniter\locale_set_default() in C:\xamppnew\htdocs\pdos\system\CodeIgniter.php:184 Stack trace: #0 C:\xamppnew\htdocs\pdos\system\bootstrap.php(181): CodeIgniter\CodeIgniter->initialize() #1 C:\xamppnew\htdocs\pdos\public\index.php(36): require('C:\\xamppnew\\htd...') #2 {main} thrown in C:\xamppnew\htdocs\pdos\system\CodeIgniter.php on line 184

Anyone can guide on how to resolve the error?