This is not the support forum for GPT-Pilot but since you got a usual error I can help you out.
You added your OpenAI key to the .env file.
This API key does not have access to the model `gpt-4-1106-preview.
What you need to do is log-in to your OpenAI account and purchase 5$ worth of credits.
Then, pretty much immediately, you should get access to the model.
Hope this helps.