ArgumentError: 1st argument: not an iodata term

[swoosh]

ArgumentError: 1st argument: not an iodata term

[princemaple]

Looks like you are using the classic setup. You are most likely missing the root. Please check the first usage option in readme.

[TheArrowsmith]

I'm not sure what you mean by missing the root. The :root option is provided by use EmailDemoWeb, :view in the normal Phoenix way:

defmodule EmailDemoWeb do
  # …

  def view do
    quote do
      use Phoenix.View,
        root: "lib/email_demo_web/templates",
        namespace: EmailDemoWeb

If you're suggesting that Swoosh is unable to find the templates at all, that's obviously not the case - just look in the screenshot. You can see that the contents of my text template ("This is a plaintext email") has been loaded within the %Phoenix.LiveView.Rendered{} struct.

The proximate cause of the problem is that the %Phoenix.LiveView.Rendered{} is being passed to :erlang.io_list_binary(), which doesn't know how to handle this type of argument. But I don't understand why this is happening.

[princemaple]

You are right. My apologies. I'm currently travelling overseas and on the phone most of the time, and won't have the opportunity to pull down your code to try it. Might be a good idea to ask on the forum or in slack.

[princemaple]

That being said, I do think you should start generating phoenix projects with 1.7 and take a look at the 1.7 issue in this repo.

[TheArrowsmith]

Well yes, but this is for an existing 1.6 app, not a greenfield project, and I can't upgrade to 1.7 just yet.

[princemaple]

Ah okay. 😅