Site feed not working

After the last WP update I noticed my rss feed is not working.
My site is: http://www.bellavidabyletty.com/

I went to feed validator who gave the following results:

Sorry

This feed does not validate.

line 1, column 36: Undefined root element: style [help]

<!– ngg_resource_manager_marker –><style type=”text/css” media=”screen”>
^
line 178, column 0: XML parsing error: <unknown>:178:0: junk after document element [help]

<script type=”text/javascript” charset=”utf-8″>
In addition, interoperability with the widest range of feed readers could be improved by implementing the following recommendation.

“text/xml” media type is not specific enough

I also tried to use the rss fix plug in but it did not work for me.

Thanks in advance for your suggestions.