FeedBurner had trouble retrieving your Source Feed: http://www.angelstudiogroup.com/?feed=rss2
The error message is:
Error on line 18: The element type "meta" must be terminated by the matching end-tag "</meta>".
Actions you can take:
Validate your Source Feed with Feed Validator. This service provides additional detail about the problem, and how to repair it.
Resync your FeedBurner feed once you have repaired the source feed.