There are other posts that talk about that same message. You should search the forum for 'Unable to download from feedUrl'
On a side note, my software detected the following problems with your feed file. I'm not sure if it would cause your problem.
Empty 'series' object found in feed file.
Empty 'short form videos' object found in feed file.
Empty 'tv special' object found in feed file.
Windows desktop software for creating BIF
(Trick Play), Direct Publisher
(MRSS, JSON), and FireTV
feeds @ GitHub/rrirower
. No programming knowledge required