My XML sitemap is not working, this seems to be a common problem, and tends to be our own damn fault in 9 out of 10 cases.
Now I'd like to fix my site to make the XML Sitemap work, but I have no idea where to start.
I've got the following error message:
This page contains the following errors:
error on line 4 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.Which can mean a lot of things. But I have no Idea where to start debugging.
Is there some sort of basic debugging guide for failing XML Sitemaps?
Some basic steps I can follow to try and make my XML work?