Post / Argument missing

Hello every body
I try to search a topic where I can find help but without search option I don’t succeed in. So I ask for assistance to solve my pb :
this warning appears when I select a post
Warning: Missing argument 1 for get_post(), called in /mnt/113/sdb/b/3/jeremievideographer/wp-content/themes/expound/functions.php on line 223 and defined in /mnt/113/sdb/b/3/jeremievideographer/wp-includes/post.php on line 371
Have you any ideas about my pb ?

Thanks from France