When i go to press update when i add a new product to a catorgry i get this

Warning: require(includes/modules/update_product.php) [function.require]: failed to open stream: No such file or directory in /home/theishop/public_html/P7Lc8EDLw9DY/product.php on line 62

Warning: require(includes/modules/update_product.php) [function.require]: failed to open stream: No such file or directory in /home/theishop/public_html/P7Lc8EDLw9DY/product.php on line 62

Fatal error: require() [function.require]: Failed opening required 'includes/modules/update_product.php' (include_path='.:/usr/lib/php:/usr/local/lib/php') in /home/theishop/public_html/P7Lc8EDLw9DY/product.php on line 62

Please help!