Hummingbird activation problem

I installed the hummingbird plugin and when i activated it, it resulted to Fatal error:
Fatal error: Call to undefined function wphb_has_cloudflare() in /home/ratelobb/public_html/modusrealestate/wp-content/plugins/wp-hummingbird/wp-hummingbird.php on line 343

here's the screenshot:
http://screencast.com/t/VOp8XUiK

please fix.

Thanks.