I have been struggling with this for 3 days now. Every time I try to generate my XML sitemap, I receive the following message:
This page contains the following errors:
error on line 2 at column 6: XML declaration allowed only at the start of the document
I have switched to different themes without any luck. The error persists. I have disabled all the plugins (except Yoast SEO ofcourse) and still no change.
I am aware that this could be because of a missing "?>" tag somewhere but I can't find it. I have also checked for whitespace in my PHP files, still nothing.
Can anyone please help or suggest anything else to try?
The link to the sitemap is:
https://www.vrtack.com/sitemap_index.xml
