为什么我得到了RateLimitError: You exceeded your current quota, please check your plan and billing details.？我已经订阅了，这是我的第一个请求。我付了订阅费。
下面是我的代码：

import openai
KEY = "mykeyhere it is checked over 10 times" //i tries to create new keys, not working, all times RATELIMITERROR
openai.api_key = KEY
def generate_response(text):
    response = openai.Completion.create(
        prompt=text,
        engine='text-davinci-003',
        max_tokens=100,
        temperature=0.7,
        n=1,
        stop=None,
        timeout=15
    )
    if response and response.choices:
        return response.choices[0].text.strip()
    else:
        return None

res = generate_response("Hello, how are you?")

print(res)

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我做错了什么，为什么我的第一个请求给予了这个错误？