Invalid Video Title or Description
The request metadata specifies an invalid or empty video title.
The request metadata specifies an invalid video description.
Recommendation:
This happens when the video title or description contains invalid characters. YouTube allows all UTF-8 characters except angled brackets (<>). Update your video title or description to remove any disallowed characters and try again.
Playlist Not Found
Playlist not found.
Recommendation:
This error occurs if the playlist linked to your video has been deleted. Choose a different playlist or leave the playlist field empty, then try republishing the video.
Invalid Video Keywords
The request metadata specifies invalid video keywords.
Recommendation:
YouTube limits the total length of video tags to 500 characters, including spaces. If your tags exceed this limit, reduce the number of tags to only those that are most relevant to the video. Try republishing after updating the tags.