can't create instance of a model class in models from controller class

thanks for the replies ; i am going to have a play with a couple new sub folders in /var/www/htdocs put php files in play with namespace & use of "use" and that it works and its not my Apache set up . i did edit php.ini /etc/httpd/extra/httpd-vhosts.conf
and /etc/httpd/httpd.conf i had one warning about curl and sqlite already being loaded.if if there is one area could be another, then i might go for fresh codeigniter install.