Can't login to admin area

I can’t seem to log into the admin area and am getting these error messages:

Warning: Missing argument 2 for wpdb::prepare(), called in /home/xxxxx/public_html/wp-content/plugins/media-library-categories/media-categories.php on line 160 and defined in /home/xxxxx/public_html/wp-includes/wp-db.php on line 990

Warning: Cannot modify header information – headers already sent by (output started at /home/xxxxx/public_html/wp-includes/wp-db.php:990) in /home/xxxxx/public_html/wp-includes/pluggable.php on line 876

I didn’t take a back-up of the site and now I can’t access it. Can anyone help please?

Thanks