INVALID_ARGUMENT error on YoutubeDataApi PlaylistItem:update

Since the end of May, error occurs has suddenly occurred when executing the YouTube data API (PlaylistItem:update).

Until then, there was no error.

[Request]

{"id": "*correct id*","snippet": {"playlistId": "*correct playlistId*","resourceId": {"kind": "youtube#video","videoId": "*correct videoId*"        },        position:0    }}

[Response(Error)]

{"error": {"code": 400,"message": "Request contains an invalid argument.","errors": [      {"message": "Request contains an invalid argument.","domain": "global","reason": "badRequest"      }    ],"status": "INVALID_ARGUMENT"  }}

• Trying on a different playlist　-> Same error occurs.
• Execute other API　-> PlaylistItem:list no error occurs.