The plugin was working fine and doing it’s thing, but suddenly (a couple of weeks ago) it stopped and blamed the source, but that site hasn’t changed anything. I also manage the source-site and know that’s not the problem, so what can I do to make this plugin work again?
The message on my site (with the plugin) is:
RSS ERROR: https://WWW.HOLWERT.FRL/RSS IS INVALID XML, LIKELY DUE TO INVALID CHARACTERS. XML ERROR: RESERVED XML NAME AT LINE 2, COLUMN 39
The page I need help with: [log in to see the link]
If you are the owner of the RSS feed, then you can try disabling the plugins one by one or the theme and see if the blank line is removed. You can use this method to find the problem. A blank line at the top will not work with any RSS feed.
To insert custom code, there are various methods. Please follow the article below. You can also Google for more info.