After upgraded to latest version. This error msg and can't access dashboard

Warning: Missing argument 2 for wpdb::prepare(), called in /home/blades6/public_html/Blog/Blog/wp-content/plugins/digiproveblog/CopyrightProof.php on line 810 and defined in /home/blades6/public_html/Blog/Blog/wp-includes/wp-db.php on line 990

Please help.

Here’s my site:
http://blog.bladesandbladesconsultancy.com/Blog/

Thanks in advance.