Use default links to avoid this kind of issues due to third party plugins.
The 'Sitemaps links rewriting' must be 'No' to have correct links as below without any error:
http://purseexpert.com/index.php?option=com_jmap&view=sitemap&format=xml
By the way i've to make you a notice about the license usage of our extensions. You contacted me and got a promo code on 10/09/2016 to use this extension for a charity website
http://orphani.com.hr/ Now you are using it on a commercial website without another valid license.
