Warnings and CSS not working

I keep getting these warnings at the top:

Warning: Missing argument 2 for wpdb::prepare(), called in /home/content/07/11683607/html/wp-content/plugins/awesome-filterable-portfolio/afp.php on line 610 and defined in /home/content/07/11683607/html/wp-includes/wp-db.php on line 992

Warning: Cannot modify header information – headers already sent by (output started at /home/content/07/11683607/html/wp-includes/wp-db.php:992) in /home/content/07/11683607/html/wp-content/plugins/awesome-filterable-portfolio/afp.php on line 611

Plus the CSS isn’t working and it won’t resize any of the images. I really need a solution or I’ll have to find another plugin

https://www.ads-software.com/plugins/awesome-filterable-portfolio/