Free extensions for Joomla!

the following error shows when I try to view my sml sitemap, I dont understand why it has suddenly stopped working. I am using joomla 2.5

XML Parsing Error: no element found
Location: http://www.barkerbakes.co.uk/index.php?option=com_xmap&view=xml&tmpl=component&id=1
Line Number 13912, Column 1:

the html sitemap looks fine, I am concerned that this will impact google etc..

anyone know what may have happened and what i need to do to fix this?