Mount does not send correct assigns in my code

Questions & Help Questions
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1

I wrote this sample project to get more familiar with LiveView, but it gives me this error on going to the live route
assign @temp not available in eex template.

here is my code

defmodule ThermoWeb.ThermoLive do

  use Phoenix.LiveView
  alias ThermoWeb.ThermoView

  def mount(_params, socket) do
    {:ok, assign(socket, :temp, 32)}
  end

  def render(assigns) do
    ~L"""
    Current temperature: <%= @temp %>
    <button phx-click="set_temp">Set</button>
    """
  end

  def handle_event("set_temp", socket) do
    {:noreply, assign(socket, :temp, 24)}
  end
end