I have followed the channels tutorial but while running these error throw
Version of the packages is channels==2.1.2 Django==2.0.4<
I was also having the same issue i did everything to resolve it, creating another virtual environment and installing older version of Django but after 2 days of hardware i came to realize that my consumers.py file was missing with just a 's' in consumer's' and after that i also corrected in my routing.py file. May be this could be your problem also please do check all the file names first.