Recently i tried to edit a post on my wordpress site and i saw the following error,(that error appears only in that specific post but i haven't any problem of editing that post the past few days as far as i remember):

Fatal error: Allowed memory size of 16777216 bytes exhausted (tried to allocate 11623 bytes) in /www/uuuq.com/o/x/y/*******/htdocs/wp-includes/formatting.php on line 134

What i have to do about it?