big problem

Can you fix this theme? i cant use my site right now. Its crashing wordpress and my site. i cant login on wordpress because there is an error: Warning: require() [function.require]: Unable to access /public/sites/www.*********.nl/wp-content/themes/monaco/inc/slider_post_type.php in /public/sites/www.*********.nl/wp-content/themes/monaco/functions.php on line 281