Failed to download with error

[bishisht]

./download.py https://ocw.mit.edu/courses/mathematics/18-06-linear-algebra-spring-2010/video-lectures/
import: unable to grab mouse `': Resource temporarily unavailable @ error/xwindow.c/XSelectWindow/9199.
from: can't read /var/mail/HTMLParser
./download.py: 6: ./download.py: base_url: not found
./download.py: 7: ./download.py: lec_url_list: not found
./download.py: 8: ./download.py: video_url_list: not found
./download.py: 9: ./download.py: vid_name_list: not found
./download.py: 10: ./download.py: video_url_list_final: not found
./download.py: 12: ./download.py: Syntax error: "(" unexpected