Unsafe attempt to load URL from frame

Hey guys, our website set up as “cookie-less” so we have our main subdomain

https://www.exampledomain.co.uk that loads all of our pages and then our static (cookie free) subdomain that loads in all of our images e.t.c static.exampledomain.co.uk

with this setup when using your plugin our sitemap.xml fails to load due to the following error (seen in the console)

Unsafe attempt to load URL https://static.****.co.uk/plugins/google-sitemap-generator/sitemap.xsl from frame with URL https://www.***.co.uk/sitemap.xml. Domains, protocols and ports must match.

Any assistance in overcomming this issue would be greatly apreciated, as idealy we would really love to use your plugin for our sitemap generation.

thanks.