Showtime Settings plugin problem

Hi

I am currently trying to get the Showtime Settings plugin to work for a radio station’s programmme schedule that I am editing, but earlier today, the plugin stopped working and now won’t let me access anything I’ve input to it.

I’m also getting the following error message, when I try and display the schedule on a page –

Warning: Missing argument 2 for wpdb::prepare(), called in /home/xxxxxxxx/public_html/xxxxxxxxxx.co.uk/wp-content/plugins/showtime/showtime.php on line 167 and defined in /home/xxxxxxxx/public_html/xxxxxxxxxx.co.uk/wp-includes/wp-db.php on line 990

Is anybody able to tell me what may be causing the plugin to not work and how I can get it working again?

Many thanks for any responses!