Feedjira setup for YouTube rss parsing

I am trying to pull in the first video from an unlisted YouTube playlist. I found the simple_parser gem but since it hasn't been updated in a few years, I decided to go with feedjira instead. I'm not sure if this is my lack of knowledge and feedjira's lack of advice for noobs or if feedjira has a bug.

Anyhow, I'm getting this error: uninitialized constant Youtube::Feedjira

Here's my code:

def open_rss    playlist_url = "https://www.youtube.com/feeds/videos.xml?playlist_id="+ playlist_id    feed = Feedjira::Feed.fetch_and_parse playlist_url    video = feed.entries.first    details = {:title => video.title,                :description => video.content,                :url => video.media_url,                :thumbnail => video.media_thumbnail_url                }    return detailsend

I don't know if I missed a setup step or what since I couldn't find much info on setting this thing up. Thanks for the help!