Why am I getting “ ## Error in sub-node ‘OpenAI Model‘” on my very first interaction with the demo ai agent project that n8n supplied immediately after setting up my account?

Not a great user experience so far.

It says:

Insufficient quota detected. Learn more about resolving this issue

You exceeded your current quota, please check your plan and billing details. For more information on this error, read the docs: https://platform.openai.com/docs/guides/error-codes/api-errors.

We have the pro plan, and I’m the only person on the team that has logged in.

OpenAI have limitation called rate limit, and maybe you use it too many times.
Also, check your billing

It was my first attempt, so. No tokens used.