My blog is Interrupting the Silence, marshmk.wordpress.com. I use the Connections theme. I have successfully submitted and verified with Google Webmaster. I submitted sitemap.xml and its status is OK. I also have a feed/ sitemap. It has been OK in the past but now has errors on lines 13 and 14 with descriptions as follows:invalid url; invalid xml: too many tags; and invalid xml attribute.
Where do I find lines 13 and 14? How do I fix these errors?