Deploying to Gigalixir not working

Deploying to prod on gigalixir shows: {"errors":{"detail":"Not Found"}}
No node for static files. It’s all API based.

When it’s delivered to dev it works.

$ - mix phx.server

[info] Running BujiWeb.Endpoint with cowboy 2.9.0 at 0.0.0.0:4000 (http)
[info] Access BujiWeb.Endpoint at http://localhost:4000

When it’s delivered to prod it doesn’t work

$ - MIX_ENV=prod mix phx.server
23:02:10.298 [info] Running BujiWeb.Endpoint with cowboy 2.9.0 at :::4000 (http)
23:02:10.310 [info] Access BujiWeb.Endpoint at http://${APP_NAME}.gigalixirapp.com:443

Any idea on why cowboy doesn’t show IP on prod? It crashes.

config/prod.exs

use Mix.Config

config :buji, BujiWeb.Endpoint,
  server: true,
  http: [port: {:system, "PORT"}], # Needed for Phoenix 1.2 and 1.4. Doesn't hurt for 1.3.
  url: [host: "${APP_NAME}.gigalixirapp.com", port: 443],
  secret_key_base: "${SECRET_KEY_BASE}",
  version: Mix.Project.config[:version] #To bust cache during hot updgrades

config :buji, Buji.Repo,
  adapter: Ecto.Adapters.Postgres,
  url: "${DATABASE_URL}",
  database: "",
  ssl: true,
  pool_size: 2

# For production, don't forget to configure the url host
# to something meaningful, Phoenix uses this information
# when generating URLs.
#
# Note we also include the path to a cache manifest
# containing the digested version of static files. This
# manifest is generated by the `mix phx.digest` task,
# which you should run after static files are built and
# before starting your production server.

# Do not print debug messages in production
config :logger, level: :info