XML error in feedburner

Hi

My site http://vamclays.com added to feedburner. when i try to configure on feedburner, it throws me error
URL does not appear to have a valid XML file.

Attached the snapshot of the error.

Note: On source code i can see ul missing, but how to add that synatax?
Which file of the wordpress has this code?

 

Where is your XML/RSS feed? I hope you're not trying to add a site.