Codeigniter 3.2.0 problem with php 8.2

I have a legacy website originally using CI 3.2 but throwing errors with php 8.2, so I found the website https://github.com/pocketarc/codeigniter/ offering modified files. I have replaced the system files and then got an error:
 
Warning: include(C:\wamp64\www\SPS\application\views\errors\html\error_php.php): Failed to open stream: No such file or directory in C:\wamp64\www\SPS\system\core\Exceptions.php on line 281

From Google advice I then created a folder/file; views/errors/html/error_php.php with contents '<?php
echo "TEST";
?>'

but now the page just shows TEST - and perhaps it should. How can I now get back to normal? I don't understand why the Exceptions.php file is throwing an error at all.

Any advice gratefully received...