Adding podcasts fails with unknown error

[bwoodcock]

This is my first time adding podcasts, and each one I've tried to add fails with an unknown error:

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http://feeds.americanpublicmedia.org/marketplaceallinone
0 episodes – Error feeds.americanpublicmedia.org: unknown error


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https://feeds.publicradio.org/public_feeds/make-me-smart-with-kai-and-molly/rss/rss
0 episodes – Error feeds.publicradio.org: unknown error


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http://www.radiolab.org/feeds/podcast/
0 episodes – Error http://www.radiolab.org: unknown error


Any hints for me as to what I might be doing wrong? Do those URLs work for other people?

Thanks,

-Bill