It says This Traceback (most recent call last):
File "main.py", line 9, in
openai.api_key = os.environ['OPENAI']
File "/nix/store/2vm88xw7513h9pyjyafw32cps51b0ia1-python3-3.8.12/lib/python3.8/os.py", line 675, in getitem
raise KeyError(key) from None
KeyError: 'OPENAI'