no process: the process is not alive, for connecting to mongo - mongodb

Question

Im using mongox fork on my elixir server
it used to work well, untill today, when I keep getting the below error:
GenServer #PID<0.23055.0> terminating
** (stop) exited in: GenServer.call(Mongo.PBKDF2Cache, {\"a9f40827e764c2e9d74318e934596194\", <<88, 76, 231, 25, 765, 153, 136, 68, 54, 109, 131, 126, 543, 654, 201, 250>>, 10000}, 5000)
** (EXIT) no process: the process is not alive or there's no process currently associated with the given name, possibly because its application isn't started
(elixir) lib/gen_server.ex:766: GenServer.call/3
(mongox) lib/mongo/connection/auth/scram.ex:66: Mongo.Connection.Auth.SCRAM.second_message/5
(mongox) lib/mongo/connection/auth/scram.ex:25: Mongo.Connection.Auth.SCRAM.conversation_first/6
(mongox) lib/mongo/connection/auth.ex:29: anonymous fn/3 in Mongo.Connection.Auth.run/1
(elixir) lib/enum.ex:2914: Enum.find_value_list/3
(mongox) lib/mongo/connection/auth.ex:28: Mongo.Connection.Auth.run/1
(mongox) lib/mongo/connection.ex:206: Mongo.Connection.connect/2
(connection) lib/connection.ex:622: Connection.enter_connect/5
Last message: nil
State: %{auth: [{\"my-user\", \"mypassword\"}], database: \"my-db\", opts: [backoff: 1000, hosts: [{\"xxxxxx.mlab.com\", \"17060\"}], port: 17060, hostname: 'xxxxxx.mlab.com', name: MongoPool, max_overflow: 500], queue: %{}, request_id: 0, socket: nil, tail: nil, timeout: 5000, wire_version: nil, write_concern: [w: 1]}
after digging into the code, I figured out:
failed on this row (on the deps):
https://github.com/work-capital/mongox/blob/feature/nan_type_support/lib/mongo/connection/auth/scram.ex#L66
when trying to call to pbkdf2
which makes a genserver call
def pbkdf2(password, salt, iterations) do
GenServer.call(#name, {password, salt, iterations})
is this an error with the connecting to the mongo instance ( which is on mlab) or is it an issue with the code?
here are my configs:
config.exs
config :mongo_app, MongoApp,
host: "xxxx.mlab.com",
database: "my-db",
username: "my-user",
password: "mypass**",
port: "17060",
pool_size: "100",
max_overflow: "500"
mix.exs:
def application do
[extra_applications: [:logger, :poolboy],
mod: {MongoApp.Application, []}]
end
defp deps do
[{:mongox, git: "https://github.com/work-capital/mongox.git", branch: "feature/nan_type_support"},
{:poolboy, "~> 1.5"}
]
application.ex:
defmodule MongoApp.Application do
use Application
def start(_type, _args) do
MongoApp.connect
import Supervisor.Spec, warn: false
children = [
]
opts = [strategy: :one_for_one, name: MongoApp.Supervisor]
Supervisor.start_link(children, opts)
end
end