Moving WordPress On Existing Server

Hi,
i follow your instructions in “Moving WordPress” but it doesn’t work
I’ve got a message error on all pages :

Warning: require_once(/home/content/50/11757050/html/wp/wp-includes/load.php) [function.require-once]: failed to open stream: No such file or directory in /home/content/50/11757050/html/wp/wp-load.php on line 48

Fatal error: require_once() [function.require]: Failed opening required ‘/home/content/50/11757050/html/wp/wp-includes/load.php’ (include_path=’.:/usr/local/php5_3/lib/php’) in /home/content/50/11757050/html/wp/wp-load.php on line 48

Thanks for your help