System Error with a part of code

/etc/apache2/httpd.conf

#LoadModule php5_module        libexec/apache2/libphp5.so

LoadModule php5_module        libexec/apache2/libphp5.so

sudo apachectl restart

In such case... I'd say that PHP is disabled in this specific folder where CKFinder is located.
Please check all .htaccess files in folders above ckfinder folder.

The "error" you see is simply the full PHP code from ckfinder/core/connector/php/connector.php, which means that this file was not executed by the web server.