CODE EXAMPLE FOR PHP

your system folder path does not appear to be set correctly. please open the following file and correct this: index.php

check your index.php file like the error said and look for $system_path and $application_folder. Those folders must exist in the root of your application, if you delete them(which you shouldn't do) or renamed them, it will cause that error

$system_path = 'system';
$application_folder = 'application';