just including this in your project breaks things (if its not from hex)

[vans163]

Unchecked dependencies for environment dev:
* exthereumex (https://github.com/exthereum/ethereumex.git)
  could not find an app file at "_build/dev/lib/exthereumex/ebin/exthereumex.app". This may happen if the dependency was not yet compiled, or you specified the wrong application name in your deps, or the dependency indeed has no app file (then you can pass app: false as option)
** (Mix) Can't continue due to errors on dependencies

[ayrat555]

@vans163 what version of elixir do you use? everything works find on elixir 1.6.5

  defp deps do
    [
      # {:dep_from_hexpm, "~> 0.3.0"},
      {:ethereumex, git: "https://github.com/exthereum/ethereumex"}
    ]
  end

[vans163]

@ayrat555 1.6.6 Seems to be upset about some app file, maybe it didn't build? Tho mix compile returned fine.

AH yea beacuse I called it exthereumex not ethereumex.