commentluv not working

I think I’m having the same problem on a site where I post book reviews. When I respond to a comment, CommentLuv tells me that
“https://www.google.com/search?client=safari&rls=en&q=A+feed+could+not+be+found+at+https://kddidit.com/blog/.+A+feed+with+an+invalid+mime+type+may+fall+victim+to+this+error,+or+SimplePie+was+unable+to+auto-discover+it..+Use+force_feed()+if+you+are+certain+this+URL+is+a+real+feed.Hover+your+mouse+here+to+see+the+data+that+CommentLuv+got+back+from+your+site..If+you+see+a+warning+or+other+error+message+then+that+might+help+you+locate+the+problem+(maybe+another+plugin+is+spitting+out+an+error%3F)&ie=UTF-8&oe=UTF-8”

I don’t understand why this isn’t working OR what it means.

Check whether you can see feed like it appear in this link https://www.thinkdigi.org/feed

commentluv uses feed to show recent post

Comment luv is working on my site until I approve the comment, then it disappears. So all the published comments on my site do not show any comment luv (but they are clearly posted in the unpublished format). Have watched all the videos. My site theme is updated to current version. I’ve tried removing the plug in and reinstalling—no difference. Does anyone know what would cause this problem? I can’t find any answers via google. thanks in advance, for any advice.
p.s. it is the free comment luv version so it isn’t pro.