Added a try/except block around progress_bar function.

main.py

@@ -10,11 +10,14 @@ def get_video_url():
 
 # Callback function to show the progress bar.
 def progress_bar(stream, _chunk, bytes_remaining):
+    try:
         current = ((stream.filesize - bytes_remaining)/stream.filesize)
         percent = ('{0:.1f}').format(current * 100)
         progress = int(50 * current)
         status = '█' * progress + '-' * (50 - progress)
         print(f'\r|{status}| {percent}%', end='')
+    except Exception as e:
+        print(f"An error has occurred: {e}")
 
 # Downloads the video.
 def video_download(video_url):