Phoenix: Running mix ecto.create Error Compiling Ranch Dependency - phoenix-framework

Question

I'm trying to go through the Up And Running tutorial on the Phoenix framework site. I have the following setup :
macOS 10.14.5
Phoenix 1.4.6
Elixir 1.8.2
Erlang/OTP 22
I create the project with the mix phx.new command. I get prompted to fetch and install the dependencies. I type Y. The dependencies get fetched and installed successfully.
I go to my project directory and enter the following command :
mix ecto.create
The following error appears :
(Mix) Could not compile dependency :ranch, "/Volumes/Macintosh HD/Users/mark/.mix/rebar3 bare compile --paths "/Code/hello/_build/dev/lib/*/ebin"" command failed.
You can recompile this dependency with "mix deps.compile ranch", update it with "mix deps.update ranch" or clean it with "mix deps.clean ranch"
I get the same error if I run mix phx.server.
If I run mix deps.clean ranch and mix deps.update ranch, it lists the following unchanged dependencies:
Resolving Hex dependencies...
Dependency resolution completed:
Unchanged:
connection 1.0.4
cowboy 2.6.3
cowlib 2.7.3
db_connection 2.0.6
decimal 1.7.0
ecto 3.1.4
ecto_sql 3.1.3
file_system 0.2.7
gettext 0.16.1
jason 1.1.2
mime 1.3.1
phoenix 1.4.6
phoenix_ecto 4.0.0
phoenix_html 2.13.2
phoenix_live_reload 1.2.0
phoenix_pubsub 1.1.2
plug 1.8.0
plug_cowboy 2.0.2
plug_crypto 1.0.0
postgrex 0.14.3
ranch 1.7.1
telemetry 0.4.0
So ranch has been compiled. But when I run mix ecto.create again, I get the same error about being unable to compile dependency :ranch.
I did an Internet search to see if anyone else had the same issue. Every issue someone had with mix ecto.create involved creating database users. No one else had an issue with ranch.
What do I have to do to get the Up and Running tutorial running properly?

Answer 1

I've run into this problem under Ubuntu, and the issue was that the ~/.configure folder was unreadable by my current user. Changing the owner and group on that folder and it's contents solved the problem for us.
I was able to recreate this problem under MacOS, using Elixir 1.7.4 and Erlang 20.1 by changing the permissions on my ~/.config folder to 600. Setting the permissions back to 755 allowed the compile.