[Python] No response when invoking response from gpt-4o-mini

I'm really new to this stuff and I'm trying to follow a tutorial for my internship. I'm following it step by step but I'm not getting output when I do python .\main.py in my virtual environment

from dotenv import load_dotenv
from pydantic import BaseModel
from langchain_openai import ChatOpenAI

load_dotenv()

llm = ChatOpenAI(model="gpt-4o-mini")
response = llm.invoke("What is the capital of France?")
print(response.content)


I tried changing the model and print statement but it just returns nothing

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