compilation errors

[lesaux]

Hello, this looks like an interesting project. There is definitely a need for a bigquery schema registry. I wanted to check it out, but I cannot get passed the 1st step! I'm on a mac and installed elixir with brew.

elixir -v
Erlang/OTP 21 [erts-10.3.2] [source] [64-bit] [smp:4:4] [ds:4:4:10] [async-threads:1] [hipe] [dtrace]

Elixir 1.8.1 (compiled with Erlang/OTP 21)

I should say that I have absolutely no erlang experience:

mix local.hex
** (FunctionClauseError) no function clause matching in IO.chardata_to_string/1

    The following arguments were given to IO.chardata_to_string/1:

        # 1
        nil

    Attempted function clauses (showing 2 out of 2):

        def chardata_to_string(string) when is_binary(string)
        def chardata_to_string(list) when is_list(list)

    (elixir) lib/io.ex:461: IO.chardata_to_string/1
    (elixir) lib/path.ex:677: Path.expand_home/1
    (elixir) lib/path.ex:154: Path.expand/1
    (stdlib) erl_eval.erl:680: :erl_eval.do_apply/6
    (stdlib) erl_eval.erl:888: :erl_eval.expr_list/6
    (stdlib) erl_eval.erl:411: :erl_eval.expr/5
    (stdlib) erl_eval.erl:888: :erl_eval.expr_list/6
    (stdlib) erl_eval.erl:240: :erl_eval.expr/5

I'm probably missing something and I am looking for pointers. Thanks!