PhP Error on Custom WordPress Install

Hey guys hopefully I can get some help with this. I am having this error code showing up in the footer of a blog that I help my friend with.

Warning: Missing argument 2 for wpdb::prepare(), called in /home/votrradioadmin/perfectpeaceplan.com/post/wp-content/themes/inove/footer.php on line 22 and defined in /home/votrradioadmin/perfectpeaceplan.com/post/wp-includes/wp-db.php on line 992

The website address is https://www.perfectpeaceplan.com. Can anyone give me some idea how I can address this? I am pretty familiar with code just not so much with php so any help in the right direction would be greatly appreciated. Thanks for your time!

Aaron