Cannot compile simple Elixir Project

Question

I´am working my way through ´Programming Elixir´ by Dave Thomas. I now hit the point where you create your first mix project. HTTPoison was just introduced and added to the application function in the mix.exs. Now the project should be compiled the first time using iex -S mix. At that point I had problems with ssl_verify_hostname. After installing erlang-src and erlang-dev I am now stuck with following console output

$ iex -S mix
Erlang/OTP 18 [erts-7.1] [source] [64-bit] [smp:8:8] [async-threads:10] [kernel-poll:false]

WARN:  Expected /home/..../issues/deps/idna to be an app dir (containing ebin/*.app), but no .app found.
WARN:  Expected /home/..../issues/deps/ssl_verify_hostname to be an app dir (containing ebin/*.app), but no .app found.
==> hackney (compile)
WARN:  Expected /home/..../issues/deps/idna to be an app dir (containing ebin/*.app), but no .app found.
WARN:  Expected /home/..../issues/deps/ssl_verify_hostname to be an app dir (containing ebin/*.app), but no .app found.
Dependency not available: idna-.* ({git,
                                       "https://github.com/benoitc/erlang-idna",
                                       {tag,"1.0.2"}})
Dependency not available: ssl_verify_hostname-.* ({git,
                                                   "https://github.com/deadtrickster/ssl_verify_hostname.erl",
                                                   {tag,"1.0.5"}})
** (ArgumentError) argument error
    (stdlib) :io.put_chars(#PID<0.26.0>, :unicode, <<69, 82, 82, 79, 82, 58, 32, 99, 111, 109, 112, 105, 108, 101, 32, 102, 97, 105, 108, 101, 100, 32, 119, 104, 105, 108, 101, 32, 112, 114, 111, 99, 101, 115, 115, 105, 110, 103, 32, 47, 104, 111, 109, 101, 47, 114, 107, 114, 97, 117, ...>>)
    (mix) lib/mix/shell.ex:78: Mix.Shell.do_cmd/2
    (mix) lib/mix/tasks/deps.compile.ex:161: anonymous fn/5 in Mix.Tasks.Deps.Compile.do_command/4
    (mix) lib/mix/project.ex:196: Mix.Project.in_project/4
    (elixir) lib/file.ex:1061: File.cd!/2
    (mix) lib/mix/dep.ex:137: Mix.Dep.in_dependency/3
    (mix) lib/mix/tasks/deps.compile.ex:160: Mix.Tasks.Deps.Compile.do_command/4
    (mix) lib/mix/tasks/deps.compile.ex:59: anonymous fn/3 in Mix.Tasks.Deps.Compile.compile/1

Although I´ve searched for different parts of this output I cannot find any helpful information.

Which Elixir version are you using? Can you upload the project to Github so we take a look? Something really weird is going on. — José Valim
Actually. I am afraid you are having a rebar issue (rebar is an Erlang build tool). Make sure you uninstall whatever rebar you have available (check with which rebar) and then try again. — José Valim
@JoséValim: Elixir version is 1.0.5. I´ve pushed the project here. rebar is not installed. Could that be the problem? — Robert Krauß
The linux distributions that break erlang up into many small parts really make it hard to use both erlang and elixir. I highly recommend installing erlang directly from erlang.org. — Fred the Magic Wonder Dog
I just want to confirm that everything worked fine locally, so it is very likely something with your Erlang installation indeed. As Fred said, I would try installing Erlang from erlang.org or from Erlang Solutions. More info in our docs: elixir-lang.org/install.html#installing-erlang — José Valim

Tiago Davi Tiago Davi · Accepted Answer · 2015-10-06T10:26:15

You must install all dependencies before it runs the code.

mix deps.get (It does download of the dependencies)

mix deps (It installs dependencies)

Cannot compile simple Elixir Project

1 Answers