[support] Blank page when trying to add an event

Hello, I'm trying to add an event, and when I try to, all I get is a blank page. When looking at my logs, I see this: PHP Fatal error: Call to undefined function: event_timezone_map() in /var/www/html/drupal/modules/event/event.module on line 1890, referer: http://beta.menashalibrary.org/node/add Line 1890 is this: '#value' => event_timezone_map(variable_get('date_default_timezone', 0)) Any ideas what may be wrong? - jody