请问出现这个问题HTTPSConnectionPool(host='api.openai.com', port=443): Max retries exceeded with url: /v1/chat/completions 是什么原因

[Macvh]

Error communicating with OpenAI: HTTPSConnectionPool(host='api.openai.com', port=443): Max retries exceeded with url: /v1/chat/completions (Caused by ProxyError('Cannot connect to proxy.', NewConnectionError('<urllib3.connection.HTTPSConnection object at 0x7f20e6998910>: Failed to establish a new connection: [Errno 111] Connection refused

[Macvh]

[threeColorFr]

这个是openAI账号免费的18美元用完了，已换openAI key