"No data scraped yet" for YouTube recommendation video info

I m trying to scrap information for YouTube main page for recommendation videos ( : video name, channel name, viewcount, ....)

I checked data preview, and it works well. (sorry for Korean laguage)

The scraper runs, but when I like to browse the scraped data, I've got the message: "No data scraped yet".
When I exported the data, scrapper didn't return any data.

How can I scrap the recommended video info..? please help me!

Url: https://m.youtube.com

Sitemap:

{"_id":"youtubemobile","startUrl":["https://m.youtube.com/"],"selectors":[{"id":"item","parentSelectors":["_root"],"type":"SelectorElement","selector":"ytm-rich-item-renderer","multiple":true,"delay":0},{"id":"title","parentSelectors":["item"],"type":"SelectorText","selector":"h3","multiple":false,"delay":0,"regex":""},{"id":"channel","parentSelectors":["item"],"type":"SelectorText","selector":"span.ytm-badge-and-byline-item-byline:nth-of-type(1)","multiple":false,"delay":0,"regex":""},{"id":"viewcount","parentSelectors":["item"],"type":"SelectorText","selector":"span:nth-of-type(3)","multiple":false,"delay":0,"regex":""},{"id":"date","parentSelectors":["item"],"type":"SelectorText","selector":"span:nth-of-type(5)","multiple":false,"delay":0,"regex":""},{"id":"thumbnail_image","parentSelectors":["item"],"type":"SelectorImage","selector":"img.cover","multiple":false,"delay":0},{"id":"link","parentSelectors":["item"],"type":"SelectorLink","selector":".media-item-metadata a","multiple":false,"delay":0}]}