--app argument should be converted to atom

Author: zambal

lib/elixir/lib/kernel/cli.ex

@@ -288,7 +288,7 @@ defmodule Kernel.CLI do
   end
 
   defp process_command({:app, app}, _config) when is_binary(app) do
-    case :application.ensure_all_started(app) do
+    case :application.ensure_all_started(binary_to_atom(app)) do
       { :error, reason } ->
         { :error, "--app : Could not start application #{app}: #{inspect reason}" }
       { :ok, _ } ->