Not able to start the phoenix app

Questions & Help Questions
1

Hi,

I am new elixir world and I am trying to run my first phoenix app. I have ran the mix phx.new command and then installed all the dependences as well. But when I run mix phx.server, I am getting this error.

[error] GenServer #PID<0.4365.0> terminating
** (UndefinedFunctionError) function :crypto.hmac/3 is undefined or private
    (crypto 5.0.3) :crypto.hmac(:sha256, "postgres", <<58, 35, 165, 97, 41, 104, 150, 113, 67, 53, 62, 175, 175, 213, 142, 78, 0, 0, 0, 1>>)
    (postgrex 0.15.0) lib/postgrex/scram.ex:52: Postgrex.SCRAM.hash_password/6
    (postgrex 0.15.0) lib/postgrex/scram.ex:26: Postgrex.SCRAM.verify/2
    (postgrex 0.15.0) lib/postgrex/protocol.ex:734: Postgrex.Protocol.auth_cont/4
    (postgrex 0.15.0) lib/postgrex/protocol.ex:579: Postgrex.Protocol.handshake/2
    (db_connection 2.4.0) lib/db_connection/connection.ex:82: DBConnection.Connection.connect/2
    (connection 1.1.0) lib/connection.ex:622: Connection.enter_connect/5
    (stdlib 3.16) proc_lib.erl:226: :proc_lib.init_p_do_apply/3
Last message: nil
State: Postgrex.Protocol

Elixir version:

Erlang/OTP 24 [erts-12.1] [source] [64-bit] [smp:8:8] [ds:8:8:10] [async-threads:1] [jit] [dtrace]

Elixir 1.12.3 (compiled with Erlang/OTP 24)

OS: Macos Bigsur 11.6

Thanks! :smiley:

2

:crypto.hmac was removed in OTP 24 after being deprecated before. Make sure you run the latest versions of your dependencies and that those are compatible with OTP 24.

3

If you’re just starting with elixir. I would just install through asdf. That way you can use multiple versions of elixir and erlang both locally and globally.

4

Hi Thank you for the reply. I just followed the getting started documentation. Here is my mix.exs dependency list

      {:phoenix, "~> 1.5.8"},
      {:phoenix_ecto, "~> 4.1"},
      {:ecto_sql, "~> 3.4"},
      {:postgrex, ">= 0.0.0"},
      {:phoenix_html, "~> 2.11"},
      {:phoenix_live_reload, "~> 1.2", only: :dev},
      {:phoenix_live_dashboard, "~> 0.4"},
      {:telemetry_metrics, "~> 0.4"},
      {:telemetry_poller, "~> 0.4"},
      {:gettext, "~> 0.11"},
      {:jason, "~> 1.0"},
      {:plug_cowboy, "~> 2.0"}

I tried running mix deps.update --all

Still I am getting the same error.

Where should I do the change?

5

You need at least version 0.15.8 of the postgrex package: postgrex/CHANGELOG.md at master · elixir-ecto/postgrex · GitHub