Invalid JSON payload received. Unknown name "": Root element must be a message."

So I've been trying to generate YouTube playlists with the corresponding video IDs, but when I try to do it in batches of 50, I get this error: "Invalid JSON payload received. Unknown name "": Root element must be a message." Details: "[{'message': 'Invalid JSON payload received. Unknown name "": Root element must be a message.', 'reason': 'invalid'}]"

def add_songs_to_playlist(playlist_id, video_ids):    for i in range(0, len(video_ids), 50):        chunk = video_ids[i:i+50]        video_objs = []        for video_id in chunk:            video_objs.append({"snippet": {"playlistId": playlist_id,"resourceId": {"kind": "youtube#video","videoId": video_id                    }                }            })        try:            youtube.playlistItems().insert(                part="snippet",                body=json.dumps(video_objs)            ).execute()        except googleapiclient.errors.HttpError as e:            error_json = json.loads(e.content)            if error_json["error"]["errors"][0]["reason"] == "videoNotFound":                print(f"Video with ID {video_id} not found.")            else:                print(f"Error adding videos to playlist: {e}")

If I do separate API calls for each insert, it works, but that's not ideal because it uses up all my quotas. I made sure all the video IDs were valid. I also used jsonlint to make sure the JSON payload was valid, and it was valid. I have been trying everything so if anyone can help, please let me know.