LAST EDITED ON Mar-05-18 AT 04:00 PM (EST)
 
Has the host gotten back to you yet? I don't mind waiting if they're/you're busy. :)

I did some troubleshooting on my end and while a reinstall doesn't fix it, a different RSS reed addon doesn't have the same error. I wouldn't be surprised if it was on my end after all, but I wanted to be sure it wasn't a site issue instead.