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Issue while installing Chatterbot

See original GitHub issue

Pip version: 19.2.1
Python version: Python 3.7.4
Operating system: Mac OS Mojave

I’m getting this error message:

ERROR: Command errored out with exit status 1:
     command: /usr/bin/python -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/private/var/folders/8z/_q3gpxbd2075gq9lfsfykj_m0000gn/T/pip-install-5iWbWu/nltk/setup.py'"'"'; __file__='"'"'/private/var/folders/8z/_q3gpxbd2075gq9lfsfykj_m0000gn/T/pip-install-5iWbWu/nltk/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base pip-egg-info
         cwd: /private/var/folders/8z/_q3gpxbd2075gq9lfsfykj_m0000gn/T/pip-install-5iWbWu/nltk/
    Complete output (1 lines):
    error in nltk setup command: 'install_requires' must be a string or list of strings containing valid project/version requirement specifiers; Expected version spec in singledispatch; python_version < "3.4" at ; python_version < "3.4"
    ----------------------------------------
ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.