Lamina.Server.ConfigModule.is_lamina_module

You're seeing just the function is_lamina_module, go back to Lamina.Server.ConfigModule module for more information.
Link to this function

is_lamina_module(module)

Specs

is_lamina_module(module()) ::
  {:ok, module()} | {:error, Lamina.Error.NotALaminaModuleError.t()}

Ensure that the module in question actually implements the Lamina behaviour.