When I try to access http://digitaleditor.com/category-sitemap.xml I get an error message. Sometime I just get a blank page and other times it is an error on line 187 of wpseo-functions.php.
Sorry I don't have the full error message it is just stopping and giving me a blank page instead of the error message.
When I test them sitemap in google webmaster tools it says there are no error but there is an error message in the issues column and I get a blank page going to the category-sitemap.xml.
This error seems to have popped up over the last month or so.