"Empty string supplied" In CoursePress

Hi there,

I'm getting an error on the Course overview page for each of my courses. It's within the instructor blocks and shows this:

Warning: DOMDocument::loadHTML(): Empty string supplied as input in on line 109

: DOMDocument::loadHTML(): Empty string supplied as input in /home/thepodca/public_html/wp-content/themes/coursepress/content-course-overview.php on line

You can see the output here:
http://www.thepodcasthost.com/members/courses/podcast-liberation-set-your-podcast-free/

Would appreciate any help you can offer,
Colin