AssistantFileService.CreateAsync returning "The v1 Assistants API has been deprecated."

[chocobot]

{ "error": { "message": "The v1 Assistants API has been deprecated. See the migration guide for more information: https://platform.openai.com/docs/assistants/migration.", "type": "invalid_request_error", "param": null, "code": "invalid_beta" } }