YT Scraping Issue: yt-live-chat-default-theme.css.map: Unexpected token < in JSON at position 0

How to?
#1

Hi, I'm a newbie and am trying to scrape video names and URLs from a youtube link (part of a course I'm taking), and right off the bat I'm having issues. I installed the latest chrome extension, opened the developer tools, created a sitemap, and I see these warnings/errors. Later, when I tried to create a Link selector, my data previews are all null. I suspect because the https://webscraper.io/ itself isn't loading properly.

Google Chrome Version 90.0.4430.212 (Official Build) (64-bit)
Webscraper version Version 0.5.4
My sitemap:
{"_id":"youtube_example","startUrl":["https://www.youtube.com/user/TheYoungTurks/videos"],"selectors":[]}

The key "" is not recognized and ignored.
DevTools failed to load SourceMap: Could not load content for chrome-extension://fheoggkfdfchfphceeifdbepaooicaho/sourceMap/chrome/iframe_handler.map: HTTP error: status code 404, net::ERR_UNKNOWN_URL_SCHEME
DevTools failed to load SourceMap: Could not load content for chrome-extension://fheoggkfdfchfphceeifdbepaooicaho/sourceMap/chrome/content.map: HTTP error: status code 404, net::ERR_UNKNOWN_URL_SCHEME

#2

Update: I removed the McAfee webadvisor extension, ran through my steps again (sitemap, then link selector). Here is what I'm getting now.

DevTools failed to load SourceMap: Could not parse content for https://www.youtube.com/user/TheYoungTurks/yt-live-chat-default-theme.css.map: Unexpected token < in JSON at position 0
content_script.js:4508 [Intervention] Unable to preventDefault inside passive event listener due to target being treated as passive. See Chrome Platform Status
t @ content_script.js:4508
content_script.js:4508 [Intervention] Unable to preventDefault inside passive event listener due to target being treated as passive. See Chrome Platform Status
t @ content_script.js:4508
content_script.js:4508 [Intervention] Unable to preventDefault inside passive event listener due to target being treated as passive. See Chrome Platform Status
t @ content_script.js:4508
content_script.js:4508 [Intervention] Unable to preventDefault inside passive event listener due to target being treated as passive. See Chrome Platform Status

#3

@hana Hi. I'm not sure where you found this error but after ispecting your sitemap i didn't see any valid selectors. For the video link extraction you can try this sitemap:

{"_id":"youtube_example","startUrl":["https://www.youtube.com/user/TheYoungTurks/videos"],"selectors":[{"id":"element-scroll","type":"SelectorElementScroll","parentSelectors":["_root"],"selector":"ytd-grid-video-renderer:nth-of-type(-n+30)","multiple":true,"delay":2000},{"id":"video-link","type":"SelectorLink","parentSelectors":["element-scroll"],"selector":"a.ytd-grid-video-renderer","multiple":false,"delay":0}]}