Error: Gemini API request failed with status code 404, { "error": { "code": 404, "message": "models/gemini-pro is not found for API version v1beta, or is not supported for generateContent. Call ListModels to see the list of available models and their supported methods.", "status": "NOT_FOUND" } }

Error: Gemini API request failed with status code 503, { "error": { "code": 503, "message": "The service is currently unavailable.", "status": "UNAVAILABLE" } }