Error: The RSS file isn’t working

We tried to get the RSS file for this podcast - https://www.bitcoin.kn/feed/podcast/ - but it wouldn’t load for us.

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Fatal Error 68: xmlParseEntityRef: no name
  Line: 133
  Column: 37array (
  'wrapperType' => 'track',
  'kind' => 'podcast',
  'collectionId' => 301670981,
  'trackId' => 301670981,
  'artistName' => 'Trace Mayer',
  'collectionName' => 'The Bitcoin Knowledge Podcast',
  'trackName' => 'The Bitcoin Knowledge Podcast',
  'collectionCensoredName' => 'The Bitcoin Knowledge Podcast',
  'trackCensoredName' => 'The Bitcoin Knowledge Podcast',
  'collectionViewUrl' => 'https://podcasts.apple.com/us/podcast/the-bitcoin-knowledge-podcast/id301670981?uo=4',
  'feedUrl' => 'https://www.bitcoin.kn/feed/podcast/',
  'trackViewUrl' => 'https://podcasts.apple.com/us/podcast/the-bitcoin-knowledge-podcast/id301670981?uo=4',
  'artworkUrl30' => 'https://is5-ssl.mzstatic.com/image/thumb/Podcasts123/v4/16/b6/04/16b6043d-286b-03fe-8d15-618d328541d3/mza_4161959552699731696.jpg/30x30bb.jpg',
  'artworkUrl60' => 'https://is5-ssl.mzstatic.com/image/thumb/Podcasts123/v4/16/b6/04/16b6043d-286b-03fe-8d15-618d328541d3/mza_4161959552699731696.jpg/60x60bb.jpg',
  'artworkUrl100' => 'https://is5-ssl.mzstatic.com/image/thumb/Podcasts123/v4/16/b6/04/16b6043d-286b-03fe-8d15-618d328541d3/mza_4161959552699731696.jpg/100x100bb.jpg',
  'collectionPrice' => 0.0,
  'trackPrice' => 0.0,
  'trackRentalPrice' => 0,
  'collectionHdPrice' => 0,
  'trackHdPrice' => 0,
  'trackHdRentalPrice' => 0,
  'releaseDate' => '2019-10-15T00:00:00Z',
  'collectionExplicitness' => 'cleaned',
  'trackExplicitness' => 'cleaned',
  'trackCount' => 267,
  'country' => 'USA',
  'currency' => 'USD',
  'primaryGenreName' => 'Investing',
  'contentAdvisoryRating' => 'Clean',
  'artworkUrl600' => 'https://is5-ssl.mzstatic.com/image/thumb/Podcasts123/v4/16/b6/04/16b6043d-286b-03fe-8d15-618d328541d3/mza_4161959552699731696.jpg/600x600bb.jpg',
  'genreIds' => 
  array (
    0 => '1412',
    1 => '26',
    2 => '1321',
    3 => '1318',
  ),
  'genres' => 
  array (
    0 => 'Investing',
    1 => 'Podcasts',
    2 => 'Business',
    3 => 'Technology',
  ),
)
front page.