xtel.cz on "[Plugin: WordPress SEO by Yoast] Yoast SEO & Woocommerce: product-sitemap.xml parsing error"

Hello,

First of all, Thank you for a great Yoast WordPress SEO plugin!
I would like to ask you for a help.

I have this sitemap http://www.xtel.cz/sitemap_index.xml
but Product sitemap http://www.xtel.cz/product-sitemap.xml got a parsing XML error.

Site is running the latest WP 3.6, WooCommerce 2.0.13, Yoast SEO 1.4.13

I've found this topic open for many users, but no one is solved.

http://support.woothemes.com/entries/22771356-Yoast-SEO-Plugin-Sitemap-Error-product-type-sitemap-xml

http://wordpress.org/support/topic/plugin-wordpress-seo-by-yoast-sitemapxml-error-using-woocommerce?replies=9

http://wordpress.org/support/topic/plugin-wordpress-seo-by-yoast-woocommerce-product_type-sitemapxml-parsing-error?replies=4

Could you help me with this issue?
Thank you.

http://wordpress.org/plugins/wordpress-seo/