Book Example didn't work - section 3.10

[bhougland18]

Hello,

I am a new Elixir programmer so I probably made a mistake, but I am having trouble with the iex example in section 3.10. When I execute the following command into iex

iex(1)> Tuesday.Playground.Timestamp |> Ash.Changeset.for_create(:create, %{title: "Hello"}) |> Ash.Changeset.apply_attributes

I get the following output:

** (Ash.Error.Forbidden)
Forbidden Error

• The domain Tuesday.Playground requires that an actor is provided at all times and none was provided.
  (ash 3.5.7) lib/ash/error/forbidden/domain_requires_actor.ex:4: Ash.Error.Forbidden.DomainRequiresActor.exception/1
  (ash 3.5.7) lib/ash/actions/helpers.ex:322: Ash.Actions.Helpers.add_actor/3
  (ash 3.5.7) lib/ash/actions/helpers.ex:274: Ash.Actions.Helpers.set_opts/3
  (ash 3.5.7) lib/ash/actions/helpers.ex:263: Ash.Actions.Helpers.set_context_and_get_opts/3
  (ash 3.5.7) lib/ash/changeset/changeset.ex:2086: Ash.Changeset.do_for_action/4
  (elixir 1.16.3) elixir.erl:405: :elixir.eval_external_handler/3
  (stdlib 4.3.1.4) erl_eval.erl:748: :erl_eval.do_apply/7
  (stdlib 4.3.1.4) erl_eval.erl:961: :erl_eval.expr_list/7
  (stdlib 4.3.1.4) erl_eval.erl:454: :erl_eval.expr/6
  (elixir 1.16.3) elixir.erl:378: :elixir.eval_forms/4
  (elixir 1.16.3) lib/module/parallel_checker.ex:112: Module.ParallelChecker.verify/1
  (iex 1.16.3) lib/iex/evaluator.ex:332: IEx.Evaluator.eval_and_inspect/3
  (iex 1.16.3) lib/iex/evaluator.ex:306: IEx.Evaluator.eval_and_inspect_parsed/3
  (iex 1.16.3) lib/iex/evaluator.ex:295: IEx.Evaluator.parse_eval_inspect/4
  (iex 1.16.3) lib/iex/evaluator.ex:187: IEx.Evaluator.loop/1
  (iex 1.16.3) lib/iex/evaluator.ex:32: IEx.Evaluator.init/5
  (stdlib 4.3.1.4) proc_lib.erl:240: :proc_lib.init_p_do_apply/3
  (ash 3.5.7) lib/ash/actions/helpers.ex:321: Ash.Actions.Helpers.add_actor/3
  (ash 3.5.7) lib/ash/actions/helpers.ex:274: Ash.Actions.Helpers.set_opts/3
  (ash 3.5.7) lib/ash/actions/helpers.ex:263: Ash.Actions.Helpers.set_context_and_get_opts/3
  (ash 3.5.7) lib/ash/changeset/changeset.ex:2086: Ash.Changeset.do_for_action/4
  iex:1: (file)

Any help you can provide would be appreciaed!