Whitespace error

Hi,
Your plugin looks really awesome. I’m looking forward to using it. However, I’m getting this error:

error on line 2 at column 6: XML declaration allowed only at the start of the document
Below is a rendering of the page up to the first error.

I think it has something to do with whitespace because I can view the page source and I see the xml starting on line 2.

https://extremecollisionrepair.com/sitemap.xml/

Any suggestions?

Thanks,
David

https://www.ads-software.com/extend/plugins/simple-multisite-sitemaps/