executable file not found in $PATH Runtime.InvalidEntrypoint

[hopewise]

Environment

• Elixir & Erlang versions:

Erlang/OTP 25 [erts-13.1.4] [source] [64-bit] [smp:12:12] [ds:12:12:10] [async-threads:1] [jit:ns] [dtrace]
Elixir 1.13.4 (compiled with Erlang/OTP 23)

• ExAws version 2.1.9
• HTTP client version. IE for hackney 1.18.1

Current behavior

I have a phoenix app, I added lambda handler as:

defmodule MyWeb.InvokeLambdaController do

  @doc """
  `invoke/1` uses ExAws.Lambda.invoke to invoke our aws-ses-lambda-v1 function.
  """
  def invoke(payload) do
    ExAws.Lambda.invoke("aws-ses-lambda-v1", payload, "no_context")
    |> ExAws.request(region: System.get_env("AWS_REGION"))
  end
end

Expected behavior

To get the region env var.

The entry point in Lambda function is defined as:

MyWeb.InvokeLambdaController:invoke
I also tried
Elixir.MyWeb.InvokeLambdaController:invoke

behavior

error,

RequestId: 791b55bf-13af-4b1e-b949-36f4a63dcd7a Error: exec: "MyWeb.InvokeLambdaController:invoke": executable file not found in $PATH
Runtime.InvalidEntrypoint

[bernardd]

That looks to me like an issue with the lambda function itself (or the way it's being called) rather than ExAws. Are you able to call it from the aws cli?