Error: The RSS file isn’t working

We tried to get the RSS file for this podcast - https://3yr97v.podcaster.de/DeutschDenken.rss - but it wouldn’t load for us.

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Fatal Error 23: EntityRef: expecting ';'
  Line: 29
  Column: 55
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Fatal Error 76: Opening and ending tag mismatch: link line 24 and head
  Line: 33
  Column: 8
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Fatal Error 41: Specification mandate value for attribute v-cloak
  Line: 39
  Column: 33
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Fatal Error 41: Specification mandate value for attribute is-nav
  Line: 48
  Column: 29
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Fatal Error 76: Opening and ending tag mismatch: img line 66 and section
  Line: 81
  Column: 11
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Fatal Error 26: Entity 'rsaquo' not defined
  Line: 360
  Column: 50
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Fatal Error 68: xmlParseEntityRef: no name
  Line: 410
  Column: 49
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Fatal Error 76: Opening and ending tag mismatch: section line 64 and div
  Line: 431
  Column: 19
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Fatal Error 76: Opening and ending tag mismatch: div line 62 and body
  Line: 437
  Column: 16
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Fatal Error 76: Opening and ending tag mismatch: body line 34 and html
  Line: 438
  Column: 8
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Fatal Error 77: Premature end of data in tag meta line 12
  Line: 438
  Column: 8
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Fatal Error 77: Premature end of data in tag meta line 11
  Line: 438
  Column: 8
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Fatal Error 77: Premature end of data in tag meta line 8
  Line: 438
  Column: 8
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Fatal Error 77: Premature end of data in tag meta line 6
  Line: 438
  Column: 8
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Fatal Error 77: Premature end of data in tag meta line 5
  Line: 438
  Column: 8
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Fatal Error 77: Premature end of data in tag meta line 4
  Line: 438
  Column: 8
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Fatal Error 77: Premature end of data in tag head line 3
  Line: 438
  Column: 8
--------
Fatal Error 77: Premature end of data in tag html line 2
  Line: 438
  Column: 8

Here’s our front page.