Phoenix: `Channel > Joining Channels` guide won't work

[ziras]

Environment

• Elixir version (elixir -v): 1.7.3
• Phoenix version (mix deps): 1.3.4
• NodeJS version (node -v): v10.11.0
• NPM version (npm -v): 6.4.1
• Operating system: OSX 10.13.6 (17G65)

Expected behavior

1. Generate a new project with mix phx.new --no-ecto hello
2. Follow the guide to uncomment channel "room:*", HelloWeb.RoomChannel
3. Follow the guide to create the lib/hello_web/channels/room_channel.ex file
4. Start server via mix phx.server
5. Open http://localhost:4000/ in a browser
6. See the phoenix welcome page

Actual behavior

1. Browser won't stop loading
2. [error] Ranch protocol :error of listener HelloWeb.Endpoint.HTTP (cowboy_protocol) terminated ** (exit) :undef is shown in the terminal

[Gazler]

I can't reproduce this locally for a new project. Do you have a repo that reproduces the issue?

[chrismccord]

Please let us know if you are have more information and care share a repo that reproduces this. Thanks!

[tmock12]

@foliolin I ran into the same issue after updating my OS to Mojave. I was able to fix it with:

mix deps.clean --all && mix deps.get

maybe something to do with system libraries? No idea..but give that a try.

[ziras]

@Gazler @chrismccord Sorry for the slow response. I did what @tmock12 did and now it's gone. Thanks!