1
The request metadata specifies an invalid or empty video title.
Or
The request metadata specifies an invalid video description.
Recommendation
This publishing error is a result of the video title (or video description) that contains character(s) that aren't allowed by YouTube. Please note YouTube allows all UTF-8 characters, except angled brackets (><). Modify your video title/description accordingly.
2
Playlist not found.
Recommendation
This error usually happens when a playlist to which you've added your video initially, has been deleted from YouTube channel. Please choose another playlist (or leave the playlist field empty) and then try to re-publish.
3
The request metadata specifies invalid video keywords.
Recommendation
This error usually happens when a video has an excessive number of tags used - YouTube allows a max of 500 characters to be used for all tags, including spaces. Please reduce the number of tags used and keep only the ones relevant to the video.