sitemap.xml breaking down with Envira Gallery plugin

Replies: 0

Hi,

I have generated the sitemap with Simple Wp Sitemap.

It was working well until yesterday I installed Envira Gallery plugin http://enviragallery.com/

This is my sitemap: http://www.dark-floors.com/sitemap.xml

Error:

XML Parsing Error: not well-formed
Location: http://www.dark-floors.com/sitemap.xml
Line Number 10, Column 53: <loc>http://www.dark-floors.com/?post_type=envira&p=818</loc&gt;

How could I fix this issue (besides uninstall Envira which I purchased…)?

thanks,
Stefano