Membership plugin giving errors can you help?

Hi there,

My membership plugin is giving an error message.

This is the information below that the membership plugin is giving me. It has only just started to happen. Everything was good before that.

Maybe something to do with the latest WordPress update do you think? That is the only thing that is new and changed on the site. I have done nothing else to the site.

I get the message when I load new users and enter their membership level.

Please advise.

Thanks, John Highman

Message:

Warning: Missing argument 2 for wpdb::prepare(), called in /home/cmem4893/public_html/wp-content/plugins/membership/membershipincludes/classes/class.membership.php on line 447 and defined in /home/cmem4893/public_html/wp-includes/wp-db.php on line 990

Warning: Cannot modify header information – headers already sent by (output started at /home/cmem4893/public_html/wp-includes/wp-db.php:990) in /home/cmem4893/public_html/wp-includes/pluggable.php on line 876