Error message

• Warning: Trying to access array offset on false in calendar_plugin_row->render() (line 431 of /web/bostonbards.org/sites/all/modules/calendar/includes/calendar_plugin_row.inc).
• Warning: Trying to access array offset on false in calendar_plugin_row->render() (line 431 of /web/bostonbards.org/sites/all/modules/calendar/includes/calendar_plugin_row.inc).