While running a Python script using NLTK I got this:
Traceback (most recent call last): File \"cpicklesave.py\", line 56, in pos = nltk.
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')