The literal string ']]>' is not allowed in element content..
After a little research I found a suggestion of inserting a space between the ']]' and '>' and it worked.
Line 67 of /components/com_jevents/views/modlatest/tmpl/rss.php
I changed
$item_description = "<![CDATA[$item_description]]>" ;
to
$item_description = "<![CDATA[$item_description]] >" ;
Jason