Phoenix framework installation fail

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Im trying to start developing in Phoenix framework on Linux Mint Uma and Im running Erlang OTP 22, Elixir 1.9 Im following the official installation guide and the problem is -- I cannot install phx_new since I have outdated Elixir version 1.9

** (Mix) You're trying to run :phx_new on Elixir v1.9.1 but it has declared in its mix.exs file it supports only Elixir ~> 1.12

I tried reinstalling elixir / erlang multiple ways, but nothing changes

phoenix elixir erlang
1 Answers

In your mix.exs file inside your phoenix app, you have something like this:

defmodule App1.MixProject do
  use Mix.Project

      def project do
        [
          app: :app1,
          version: "0.1.0",
          elixir: "~> 1.12",
          elixirc_paths: elixirc_paths(Mix.env()),
          compilers: [:phoenix, :gettext] ++ Mix.compilers(),
          start_permanent: Mix.env() == :prod,
          aliases: aliases(),
          deps: deps()
        ]
      end

The line:

elixir: "~> 1.12"

means the elixir version necessary to run your app must be:

>= 1.12 and < 2.0.0

Note that elixir 1.9.1 is not in that range. If you want to use elixir 1.9.1 in your app, then tell Phoenix that:

elixir: "~> 1.9.1",

To find out what elixir and erlang your system thinks is installed, use:

$ elixir -v
Erlang/OTP 24 [erts-12.0.2] [source] [64-bit] [smp:4:4] [ds:4:4:10] [async-threads:1]

Elixir 1.12.3 (compiled with Erlang/OTP 22)

I use asdf to install different versions of elixir/erlang and to switch between versions.

user_9261430
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