Error: The RSS file isn’t working

We tried to get the RSS file for this podcast - http://tonic.libsyn.com/rss - but it wouldn’t load for us.

array (
  'wrapperType' => 'track',
  'kind' => 'podcast',
  'collectionId' => 978981862,
  'trackId' => 978981862,
  'artistName' => 'Leila Lindholm & Niklas Ekstedt',
  'collectionName' => 'Eat This!',
  'trackName' => 'Eat This!',
  'collectionCensoredName' => 'Eat This!',
  'trackCensoredName' => 'Eat This!',
  'collectionViewUrl' => 'https://podcasts.apple.com/us/podcast/eat-this/id978981862?uo=4',
  'feedUrl' => 'http://tonic.libsyn.com/rss',
  'trackViewUrl' => 'https://podcasts.apple.com/us/podcast/eat-this/id978981862?uo=4',
  'artworkUrl30' => 'https://is5-ssl.mzstatic.com/image/thumb/Podcasts123/v4/94/61/5c/94615cc9-2c0c-f87d-9fa6-27f382e53954/mza_6124295471550648045.jpg/30x30bb.jpg',
  'artworkUrl60' => 'https://is5-ssl.mzstatic.com/image/thumb/Podcasts123/v4/94/61/5c/94615cc9-2c0c-f87d-9fa6-27f382e53954/mza_6124295471550648045.jpg/60x60bb.jpg',
  'artworkUrl100' => 'https://is5-ssl.mzstatic.com/image/thumb/Podcasts123/v4/94/61/5c/94615cc9-2c0c-f87d-9fa6-27f382e53954/mza_6124295471550648045.jpg/100x100bb.jpg',
  'collectionPrice' => 0.0,
  'trackPrice' => 0.0,
  'trackRentalPrice' => 0,
  'collectionHdPrice' => 0,
  'trackHdPrice' => 0,
  'trackHdRentalPrice' => 0,
  'releaseDate' => '2017-12-14T05:00:00Z',
  'collectionExplicitness' => 'cleaned',
  'trackExplicitness' => 'cleaned',
  'trackCount' => 62,
  'country' => 'USA',
  'currency' => 'USD',
  'primaryGenreName' => 'Food',
  'contentAdvisoryRating' => 'Clean',
  'artworkUrl600' => 'https://is5-ssl.mzstatic.com/image/thumb/Podcasts123/v4/94/61/5c/94615cc9-2c0c-f87d-9fa6-27f382e53954/mza_6124295471550648045.jpg/600x600bb.jpg',
  'genreIds' => 
  array (
    0 => '1306',
    1 => '26',
    2 => '1301',
    3 => '1303',
  ),
  'genres' => 
  array (
    0 => 'Food',
    1 => 'Podcasts',
    2 => 'Arts',
    3 => 'Comedy',
  ),
)...https://itunes.apple.com/lookup?id=978981862

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