Cannot use Deepseek

I use offical Deepseek, and tested ok, but after imported the pdf, it prompts the following error, seems it is still using ChatGPT instead of Deepseek.

openai.PermissionDeniedError: Error code: 403 - {'error': {'code': 'unsupported_country_region_territory', 'message': 'Country, region, or territory not supported', 'param': None, 'type': 'request_forbidden'}}