TypeError: '>=' not supported between instances of 'NoneType' and 'float'

[marymary22]

Hello,
When I try to run the project python sentiment.py data/imdb/ 0
I get those errors
File "sentiment.py", line 251, in
main()
File "sentiment.py", line 31, in main
train_pos_vec, train_neg_vec, test_pos_vec, test_neg_vec = feature_vecs_NLP(train_pos, train_neg, test_pos, test_neg)
File "sentiment.py", line 97, in feature_vecs_NLP
(val >= len(train_pos)/100 or neg_words.get(key) >= len(train_neg)/100) and
TypeError: '>=' not supported between instances of 'NoneType' and 'float'