Adding YouTube video to playlist via google script results in unhelpful error message [duplicate]

I want to add some YouTube videos to my own playlist via Google Apps Script.

I added the necessary resources, and I am able to load videos from the playlist.

The code should be relative simple:

function add_video_to_playlist() {  const playlist_id = "MY_PLAYLIST_ID";  const video_id = "dQw4w9WgXcQ";  const video_snippet = {    playlistId: playlist_id,    resourceId: {      kind: "youtube#video",      videoId: video_id    }  }  YouTube.PlaylistItems.insert(video_snippet, "snippet");  console.log("Video added successfuly!");}

and was inspired by following Stack Overflow answer:https://stackoverflow.com/a/63424661/13278191

But I get a weird error message, whenever I run my function:

GoogleJsonResponseException: API call to youtube.playlistItems.insert failed with error: Required

Just the word "Required" is not very helpful, but that's all I got, as seen again in this screenshot: Error message

The official error messages page does not have anything listed for this keyword either

Did someone maybe encounter the same error message?