Multiple RSS Feed Errors

My website was working just fine a couple of days ago, but now I am getting multiple errors with my RSS feed. These errors are causing my posts to not appear with the comment luv plugin when I leave comments on other blogs, and I can’t view my feed in feedburner. I checked the feed on this feed validation site http://validator.w3.org/feed/check.cgi?url=http%3A%2F%2Fhealthymomsmagazine.net%2Ffeed#l219

These are the errors I got:This feed does not validate.
line 219, column 103: XML parsing error: <unknown>:219:103: not well-formed (invalid token) [help]
… d caught in the deep, pristine waters of the coast of Norway using trad …
^
In addition, interoperability with the widest range of feed readers could be improved by implementing the following recommendations.
line 43, column 0: content:encoded should not contain srcset attribute (8 occurrences) [help]
<p><img class=”aligncenter wp-image-8797 size-full” src=”http://healthymomsm …
line 43, column 0: content:encoded should not contain sizes attribute (8 occurrences) [help]
<p><img class=”aligncenter wp-image-8797 size-full” src=”http://healthymomsm …
line 90, column 0: content:encoded should not contain script tag [help]
<p><script src=”//static.inlinkz.com/cs2.js?v=116″ type=”text/javascript”></ …
Source: http://healthymomsmagazine.net/feed

How do I fix these errors? I recently installed the Yost SEO plugin. Could that be messing up my feed? My site runs on the WPZoom framework. Are there problems with this framework? Please help!