Ultimate FB plugin Events widget

Today I purchased the Ultimate FB plugin & am trying to get the Events widget to display. Right now the site doesn’t look like much but want to see how the plugin will work. I am getting the following error : “Warning: usort() expects parameter 1 to be array, null given in /home/content/37/10240137/html/wp-content/plugins/wpmu-dev-facebook/lib/class_wdfb_widget_events.php on line 175”

Searched support forum & saw others w/ same error but no solutions posted. Please help!