Phoenix App not starting!

I’m getting the following error while trying to start my application, and i’m not understading why this is happening

ERROR:

> [info] Application stock exited: Stock.start(:normal, []) returned an error: shutdown: failed to start child: Stock.Endpoint
>     ** (EXIT) shutdown: failed to start child: Phoenix.Endpoint.Server
>         ** (EXIT) an exception was raised:
>             ** (UndefinedFunctionError) function Stock.UserSocket.__transports__/0 is undefined (module Stock.UserSocket is not available)
>                 Stock.UserSocket.__transports__()
>                 (phoenix) lib/phoenix/endpoint/cowboy_handler.ex:68: anonymous fn/3 in Phoenix.Endpoint.CowboyHandler.child_spec/3
>                 (elixir) lib/enum.ex:1948: Enum."-reduce/3-lists^foldl/2-0-"/3
>                 (phoenix) lib/phoenix/endpoint/cowboy_handler.ex:67: Phoenix.Endpoint.CowboyHandler.child_spec/3
>                 (phoenix) lib/phoenix/endpoint/server.ex:17: anonymous fn/5 in Phoenix.Endpoint.Server.init/1
>                 (elixir) lib/enum.ex:1948: Enum."-reduce/3-lists^foldl/2-0-"/3
>                 (phoenix) lib/phoenix/endpoint/server.ex:15: Phoenix.Endpoint.Server.init/1        
>                 (stdlib) supervisor.erl:294: :supervisor.init/1
>                 (stdlib) gen_server.erl:365: :gen_server.init_it/2
>                 (stdlib) gen_server.erl:333: :gen_server.init_it/6
>                 (stdlib) proc_lib.erl:247: :proc_lib.init_p_do_apply/3
> ** (Mix) Could not start application stock: Stock.start(:normal, []) returned an error: shutdown: failed to start child: Stock.Endpoint
>     ** (EXIT) shutdown: failed to start child: Phoenix.Endpoint.Server
>         ** (EXIT) an exception was raised:
>             ** (UndefinedFunctionError) function Stock.UserSocket.__transports__/0 is undefined (module Stock.UserSocket is not available)
>                 Stock.UserSocket.__transports__()
>                 (phoenix) lib/phoenix/endpoint/cowboy_handler.ex:68: anonymous fn/3 in Phoenix.Endpoint.CowboyHandler.child_spec/3
>                 (elixir) lib/enum.ex:1948: Enum."-reduce/3-lists^foldl/2-0-"/3
>                 (phoenix) lib/phoenix/endpoint/cowboy_handler.ex:67: Phoenix.Endpoint.CowboyHandler.child_spec/3
>                 (phoenix) lib/phoenix/endpoint/server.ex:17: anonymous fn/5 in Phoenix.Endpoint.Server.init/1
>                 (elixir) lib/enum.ex:1948: Enum."-reduce/3-lists^foldl/2-0-"/3
>                 (phoenix) lib/phoenix/endpoint/server.ex:15: Phoenix.Endpoint.Server.init/1        
>                 (stdlib) supervisor.erl:294: :supervisor.init/1
>                 (stdlib) gen_server.erl:365: :gen_server.init_it/2
>                 (stdlib) gen_server.erl:333: :gen_server.init_it/6
>                 (stdlib) proc_lib.erl:247: :proc_lib.init_p_do_apply/3

My mix.exs file

defmodule Stock.Mixfile do

  use Mix.Project

  def project do

    [app: :stock,

     version: "0.0.1",

     elixir: "~> 1.2",

     elixirc_paths: elixirc_paths(Mix.env),

     compilers: [:phoenix, :gettext] ++ Mix.compilers,

     build_embedded: Mix.env == :prod,

     start_permanent: Mix.env == :prod,

     aliases: aliases(),

     deps: deps()]

  end

  # Configuration for the OTP application.

  #

  # Type `mix help compile.app` for more information.

  def application do

    [mod: {Stock, []},

     applications: [:phoenix, :phoenix_pubsub, :phoenix_html, :cowboy, :logger, :gettext,

                    :phoenix_ecto, :postgrex, :ueberauth, :ueberauth_github]]

  end

  # Specifies which paths to compile per environment.

  defp elixirc_paths(:test), do: ["lib", "web", "test/support"]

  defp elixirc_paths(_),     do: ["lib", "web"]

  # Specifies your project dependencies.

  #

  # Type `mix help deps` for examples and options.

  defp deps do

    [{:phoenix, "~> 1.2.5"},

     {:phoenix_pubsub, "~> 1.0"},

     {:phoenix_ecto, "~> 3.4.0"},

     {:postgrex, ">= 0.0.0"},

     {:phoenix_html, "~> 2.6"},

     {:phoenix_live_reload, "~> 1.0", only: :dev},

     {:gettext, "~> 0.11"},

     {:cowboy, "~> 1.0"},

     {:ueberauth, "~> 0.3"},

     {:ueberauth_github, "~> 0.4"}]

  end

  # Aliases are shortcuts or tasks specific to the current project.

  # For example, to create, migrate and run the seeds file at once:

  #

  #     $ mix ecto.setup

  #

  # See the documentation for `Mix` for more info on aliases.

  defp aliases do

    ["ecto.setup": ["ecto.create", "ecto.migrate", "run priv/repo/seeds.exs"],

    "ecto.reset": ["ecto.drop", "ecto.setup"]]

  end

end

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