[Plugin: The Events Calendar] Calendar page makes header dissapear

I put the calendar on a page http://calaverasleadership.com/category/events/

The header disapears and I get this error

Warning: uksort() [function.uksort]: The argument should be an array in /home/shell/public_html/wp-content/themes/FlexxSensation/lib/featured-images2/featured-images2.php on line 1276

also the calendar and events list view is in the widget area

any ideas how to fix this?

http://wordpress.org/extend/plugins/the-events-calendar/