Evaluation of the code stopped at line 0 before the end because of the following error:
The variable `url` is not defined.
Traceback (most recent call last):
  File "C:\AI\main.py", line 41, in <module>
    collaborate()
  File "C:\AI\main.py", line 19, in collaborate
    print("OpenAI Agent: Code generated\n", code1["output"])
TypeError: 'NoneType' object is not subscriptable