Invalid tag value (subdomain sitemap)

[amirshahedi]

Hello,
Dear XML-Sitemap support,

After I installed new update 6.1 my problem started. To prevent errors (time and memory) I installed sitemap generator in sub domain of my website and worked and after upgrade, my website lost its Alexa rate and search engines' visitors to a great extent.
In Google webmaster it shows this massage for all sitemap:
Errors (Invalid tag value)This XML tag has an invalid value. Please fix it and resubmit.

Please help me ... for more info I attached the error from google webmaster.

Thanks
Best Regards,

[XML-Sitemaps Support]

Hello,

what is your sitemap URL?
Note that sitemap is not related to pages/website ranking and is only used to help (inform) search engine to crawl your site.