Adding media resolution to the settings results in a 400 error - chatting

Gemini API
1

I use the Gemini-3-Pro-Image Preview or Gemini-2.5-Flash-Image model.

messageConfig = types.GenerateContentConfig(
       media_resolution=types.MediaResolution.MEDIA_RESOLUTION_HIGH,
       temperature=2.0,
       seed=None,
       max_output_tokens=None,
       image_config=types.ImageConfig{
           image_size = "1k",
           aspect_ratio = "1:1"
       },
)
chatResponse = chat.send_message(
       message = parameters["prompt"],
       config = parameters["messageConfig"]
)

If you run the code above, the following error occurs.

400 INVALID_ARGUMENT. {‘error’: {‘code’: 400, ‘message’: ‘Request contains an invalid argument.’, ‘status’: ‘INVALID_ARGUMENT’}}

2

I found a problem
This parameter is supported in the v1alpha API version.
I hope others don’t make stupid mistakes.

I will attach a link to the relevant content below.

https://ai.google.dev/gemini-api/docs/media-resolution