RSS feed wont validate

If you disable your plugins, does it then work?

I’d check each plugin file for extra lines or whitespace before the first <? and after the last ?>

Just tried disabling all plugins and am still having the same problem.

Interesting. This one works: https://spouse-catch-cheating.info/wp/wp-rss2.php

Just tried to validate spouse-catch-cheating.info/wp/wp-rss2.php at feedvalidator.org and got the following.

Sorry

This feed does not validate.

Server returned HTTP Error 404: Not Found [help]

In addition, this feed has issues that may cause problems for some users. We recommend fixing these issues.

line 27, column 3: Avoid content:encoded (20 occurrences) [help]
<content:encoded><![CDATA[Virtual Adultery Where a husband or wife has …
^
line 38, column 3: wfw:commentRSS should be wfw:commentRss (20 occurrences) [help]
<wfw:commentRSS>https://spouse-catch-cheating.info/wp/2006/05/28/virtual-a …

Anyone else have any ideas?