I check your website and sitemap but that's not the problem.
The sitemap is generated perfectly: https://www.gatewaytosedona.com/index.php?option=com_jmap&view=sitemap&format=xml
The problem appears to be on your server when Google Bot access your website. Indeed it answer with a strange Chinese page... i hope that the server has not been hacked.
You can test it on the bot simulator service: http://www.botsimulator.com/
see self-explaining screenshot
I recommend to contact your hosting provider immediately. Hope this helps.