[Plugin: XML Sitemap Generator]

i use Google XML Sitemaps
http://wordpress.org/extend/plugins/google-sitemap-generator/

But
Site map for Custom taxonomy shows like this
http://www.mysite.com/?taxonomy=&term=

why dnt it shows the proper parmalink structure in sitemap as shown on the site
which is http://www.mysite.com/mycustomtaxonomy/post-title