TypeError: object of type 'NoneType' has no len() with #3 settings

[SeekPoint]

(.venv) ub16hp@UB16HP:/ub16_prj/cnn-re-tf$ python distant_supervision.py
===== step 1 =====
[1/4] Downloading wiki articles ...
===== step 2 =====
[1/4] Downloading wiki articles ...
===== step 3 =====
[1/4] Downloading wiki articles ...
===== step 4 =====
[1/4] Downloading wiki articles ...
===== step 5 =====
[1/4] Downloading wiki articles ...
===== step 6 =====
[1/4] Downloading wiki articles ...
===== step 7 =====
[1/4] Downloading wiki articles ...
Traceback (most recent call last):
File "distant_supervision.py", line 693, in
main()
File "distant_supervision.py", line 681, in main
positive_examples()
File "distant_supervision.py", line 452, in positive_examples
ret = loop(step, doc_id, limit, entities, relations, counter)
File "distant_supervision.py", line 343, in loop
docs = download_wiki_articles(doc_id, limit)
File "distant_supervision.py", line 73, in download_wiki_articles
pages = bs(r, "html.parser").findAll('page')
File "/home/ub16hp/ub16_prj/cnn-re-tf/.venv/local/lib/python2.7/site-packages/bs4/init.py", line 246, in init
elif len(markup) <= 256 and (
TypeError: object of type 'NoneType' has no len()
(.venv) ub16hp@UB16HP:/ub16_prj/cnn-re-tf$