Wordress Feed Error

My WordPress Feed is having errors. I originally had it setup to feedburner. I’ve since deactivated it to see if that helps – it hasn’t helped.

Here’s the feed link:
http://aboutresultsmarketing.com/marketing_blog/feed/

I’ve deactivated both Bsuite and Sharethis – the plugins named in the violation. But I don’t know what code to change in order to fix the error.

Thanks for you help in advance,
David