[Hall of Famer]

Looks like your domain or script path is incorrectly configured, open config.php and edit them to what match your actual path to the adoptbles site. Keep in mind that the domain and script path info are case sensitive, i've had users who believed they had entered the correct path but accidentally made a mistake on upper/lower case letters. A less likely cause is that it may be a problem with your .htaccess file, if you don't have it you will need to reupload that file. .htaccess is used for URL rewrite, it is crucial for this script to execute properly.