Debugging with IntelliJ fails

Thank you for your detailed explanation. I made sure each settings.

Verify you have an Elixir SDK
Verify you have an Internal Erlang SDK on the Elixir SDK

Verify the Elixir SDK has both Elixir and Erlang ebin directories like …/elixir/ebin and erlang/lib/kernel-5.4.1/ebin

I checked the following directories exist:

/Users/tsuyoshi.yamaguchi/.kiex/elixirs/elixir-1.6.5/lib/elixir/lib/elixir/ebin
~/erlang/20.3/lib/kernel-5.4.3/ebin

Verify Project SDK is the Elixir SDK?

Click each Module and verify they also have the Elixir SDK set.

Run/Debug configuration is set:

I think all settings seem to be set correctly, but it still shows the same error.
BTW, I’m using Kiex as an Elixir version management tool. Do you think it could possibly be the cause of the problem?