RSS feed error

I have come up with the following but cannot figure out which file to edit, I have tried looking in all files that have to do with rss but nothing is fixing this.

https://feedvalidator.org/check.cgi?url=https://www.badboysbilliardprod.com/

usually it’s a plugin that inserts the blank line
you can deactivate all plugins and test
if feed works, re-activate one by one testing in between
or
try this plugin
https://www.ads-software.com/extend/plugins/broken-rss-feed-fixer/

Samuel B…thanks for the input, I have tried disabling the plugins and it does not fix it, the broken feed fixer does nothing but re-create a new one, I need to try to get this one fixed instead of going around it. Do you by chance know the file that the extra line can be found in if this is the problem? Thanks again.

Brent