No erlang version specified

We were trying to get set up with the project, but no erlang version is specified. First, I tried with Erlang 21.1 and Elixir 1.4, but I don't think they are compatible and I was getting this output while running any mix commands

=SUPERVISOR REPORT==== 11-Feb-2019::20:19:23.412610 ===
    supervisor: {local,'Elixir.Logger.Supervisor'}
    errorContext: start_error
    reason: noproc
    offender: [{pid,undefined},
               {id,'Elixir.Logger.ErrorHandler'},
               {mfargs,
                   {'Elixir.Logger.Watcher',watcher,
                       [error_logger,'Elixir.Logger.ErrorHandler',
                        {true,false,500}]}},
               {restart_type,permanent},
               {shutdown,5000},
               {child_type,worker}]
=CRASH REPORT==== 11-Feb-2019::20:19:23.418116 ===
  crasher:
    initial call: application_master:init/4
    pid: <0.82.0>
    registered_name: []
    exception exit: {{shutdown,
                         {failed_to_start_child,'Elixir.Logger.ErrorHandler',
                             noproc}},
                     {'Elixir.Logger.App',start,[normal,[]]}}
      in function  application_master:init/4 (application_master.erl, line 138)
    ancestors: [<0.81.0>]
    message_queue_len: 1
    messages: [{'EXIT',<0.83.0>,normal}]
    links: [<0.81.0>,<0.42.0>]
    dictionary: []
    trap_exit: true
    status: running
    heap_size: 376
    stack_size: 27
    reductions: 193
  neighbours:

=INFO REPORT==== 11-Feb-2019::20:19:23.421487 ===
    application: logger
    exited: {{shutdown,
                 {failed_to_start_child,'Elixir.Logger.ErrorHandler',noproc}},
             {'Elixir.Logger.App',start,[normal,[]]}}

I found this site, which suggests that Elixir 1.4 is only compatible with Erlang 18-19 https://github.com/elixir-lang/elixir/blob/master/lib/elixir/pages/Compatibility%20and%20Deprecations.md, but when trying to install both 19.0 and 19.3 I got this output

* crypto         : No usable OpenSSL found
 * jinterface     : No Java compiler found
 * ssh            : No usable OpenSSL found
 * ssl            : No usable OpenSSL found

it installed correctly, but then I got this output when trying to run mix deps.get

Could not start Hex. Try fetching a new version with "mix local.hex" or uninstalling it with "mix archive.uninstall hex.ez"
** (MatchError) no match of right hand side value: {:error, {:ssl, {'no such file or directory', 'ssl.app'}}}
    (hex) lib/hex.ex:7: Hex.start/0
    (mix) lib/mix/hex.ex:53: Mix.Hex.start/0
    (mix) lib/mix/dep/loader.ex:144: Mix.Dep.Loader.with_scm_and_app/4
    (mix) lib/mix/dep/loader.ex:99: Mix.Dep.Loader.to_dep/3
    (elixir) lib/enum.ex:1229: Enum."-map/2-lists^map/1-0-"/2
    (mix) lib/mix/dep/loader.ex:302: Mix.Dep.Loader.mix_children/1
    (mix) lib/mix/dep/loader.ex:18: Mix.Dep.Loader.children/0
    (mix) lib/mix/dep/converger.ex:56: Mix.Dep.Converger.all/4

and mix local.hex

** (MatchError) no match of right hand side value: {:error, {:ssl, {'no such file or directory', 'ssl.app'}}}
    (mix) lib/mix/utils.ex:432: Mix.Utils.read_httpc/1
    (mix) lib/mix/utils.ex:376: Mix.Utils.read_path/2
    (mix) lib/mix/local.ex:139: Mix.Local.read_path!/2
    (mix) lib/mix/local.ex:118: Mix.Local.find_matching_versions_from_signed_csv!/2
    (mix) lib/mix/tasks/local.hex.ex:29: Mix.Tasks.Local.Hex.run/1
    (mix) lib/mix/task.ex:300: Mix.Task.run_task/3
    (mix) lib/mix/cli.ex:58: Mix.CLI.run_task/2

I saw that we are actually using Elixir 1.4.5, which is compatible with Erlang 20 so I am installing that to see if it makes any difference.

AgileVentures / sing_for_needs

No erlang version specified #11