How to make a XML site map for www.ads-software.com

I was using wordpress.com before so i did not had to do any thing to make a XML sitemap for my gamefixed.com blog

I need that sitemap only for searchengine like google

i tried a pluggin which created a sitemap

https://gamefixed.com/sitemap.xml

But when i added it in google webmaster tools in sitemap

it showed a big red Cross

please tell me what to do