The referrer https://www.googleapis.com/youtube/v3/playlistItems?part=id,snippet,contentDetails,status&maxResults=12&playlistId=PLQ9XMUXC46Fdtcose_efs9N9gJxqZjfLb&key=AIzaSyC8I4R4tSU7CWGiLSJL6cxrggIbDR35xDE does not match the referrer restrictions configured on your API key. Please use the API Console to update your key restrictions.