[Python] openai.error.RateLimitError: You exceeded your current quota, please check your plan...

I recently obtained a free API key from OpenAI and attempted to use it in my script. However, I encountered the following error on my very first attempt:

openai.error.RateLimitError: You exceeded your current quota, please check your plan and billing details.

I haven't used the API key before, so I'm puzzled by this error. Could someone please help me understand what might be causing this issue and how I can resolve it?

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