NameError in Project #30 Youtube video download

[liuxx437]

Error message received:
Exception in Tkinter callback
Traceback (most recent call last):
File "C:\Users\liuw09\AppData\Local\Programs\Python\Python310\lib\tkinter_init_.py", line 1921, in call
return self.func(*args)
File "c:\Users\liuw09\OneDrive - Abbott\Projects\Python\python-mini-project\Youtube_video_download\main.py", line 25, in Download
video = url.streams.filter(file_extension=extension).first()
NameError: name 'extension' is not defined

[Akhilbisht798]

hey, I have created a pull request regarding this issue.
#59
open for feedback and changes.