Traceback (most recent call last):


 "<stdin>", line 1, in <module>
ImportError: cannot import name PunktWordTokenizer`
`Traceback (most recent call last):


 "/Library/Frameworks/Python.framework/Versions/3.6/bin/urh", line 6, in <module>

from pkg_resources import load_entry_point


 "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pkg_resources/__init__.py", line 33, in <module>

import platform


 "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/platform.py", line 116, in <module>

import sys, os, re, subprocess


 "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/subprocess.py", line 136, in <module>

import _posixsubprocess
ImportError: dlopen(/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/_posixsubprocess.so, 2): Symbol not found: _PyString_AsString
