I have this error when i open the url wecanpro.it/sitemap.xml
error at line 2 column 6: XML declaration allowed only at start of declaration
Generatepress Child Theme
Generatepress Pro plugin
Server Apache on Siteground
I tried using various plugins (seo-all-in-one, simply sitemap etc) but there is always the same error.
I also contacted Siteground support and they tell me it depends on white space on the theme