Facing Open AI key problem

When i am trying to run this code it is throwing an error

import openai

Set up OpenAI API key

openai.api_key = ‘■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■LIrqIpOx’

def generate_story(prompt):
try:
# Generate the story using ChatGPT
response = openai.Completion.create(
engine=“text-embedding-3-small”,
prompt=prompt,
max_tokens=150
)
return response.choices[0].text.strip()
except Exception as e:
print(“Error:”, e)
return None

def main():
# Prompt for the story
prompt = “Once upon a time, in a faraway land, there was a brave knight named Sir Lancelot.”

# Generate the story
story = generate_story(prompt)

# Print the generated story
print("Generated Story:")
print(story)

if name == “main”:
main()

and the result is

PS C:\Mygenai> py llm3.py
Error: You are not allowed to sample from this model
Generated Story:
None


How i can solve this