NLTK Lookup Error
TL;DR
import nltk
nltk.download('averaged_perceptron_tagger')
Or to download all packages + data + docs:
import nltk
nltk.download('all')
See How do I download NLTK data?
First answer said the missing module is 'the Perceptron Tagger', actually its name in nltk.download is 'averaged_perceptron_tagger'
You can use this to fix the error
nltk.download('averaged_perceptron_tagger')
Use
>>> nltk.download()
to install the missing module (the Perceptron Tagger).
(check also the answers to Failed loading english.pickle with nltk.data.load)