Unresolved "Getting Started" Issue

I've tried to work through the "Getting Started" tutorial a bunch of
times and I always hit a wall.

It's a great tutorial, but either there is a typo, or I am using the
wrong version of either Rails or Ruby.

I am using Rails 2.3.2 and Ruby 1.8.6. The tutorial does not indicate
that Ruby 1.9 is required, does anyone know if it is? I doubt it.

All my files match the tutorial. When I try to click on "Manage
Comments:" on
http://localhost:3000/posts/2

My browser makes the HTTP request: http://localhost:3000/posts/2/comments

I get an error that says:
ActionController::RoutingError in Comments#index
Showing app/views/comments/index.html.erb where line #13 raised:

post_comment_url failed to generate from {:post_id=>#<Post id: 2,
name: "Jaymes Dec", title: "Come on!", content: "You can do it!",
created_at: "2009-08-13 15:32:15", updated_at: "2009-08-13
15:32:15">, :controller=>"comments", :action=>"show", :id=>nil},
expected: {:controller=>"comments", :action=>"show"}, diff:
{:post_id=>#<Post id: 2, name: "Jaymes Dec", title: "Come on!",
content: "You can do it!", created_at: "2009-08-13 15:32:15",
updated_at: "2009-08-13 15:32:15">, :id=>nil}

My index is:

<code>
<h1>Comments for <%= @post.title %></h1>

<table>
  <tr>
    <th>Commenter</th>
    <th>Body</th>
  </tr>

<% for comment in @comments %>
  <tr>
   <td><%=h comment.commenter %></td>
   <td><%=h comment.body %></td>
   <td><%= link_to "Show", post_comment_path(@post,@comment)%>
  </td>
  <td><%= link_to "Edit", edit_post_comment_path(@post, @comment)%>
  </td>
  <td><%= link_to "Destroy", post_comment_path(@post,
@comment), :confirm => "Are you sure?", :method => :delete %>
  </td>
  <tr>
<% end %>
</table>

<br />

<%= link_to "New Comment", new_post_comment_path(@post)%>
<%= link_to "Back to Post", @post%>
</code>

I've seen in other forums that at least two other people had the same
error, but no resolution.

Thanks to anyone who can help point me in the right direction!

Oh and if you need it, here is my comments_controller.rb
<code>
class CommentsController < ApplicationController
  def index
    @post = Post.find(params[:post_id])
    @comments = @post.comments
  end

  def show
    @post = Post.find(params[:post_id])
    @comment = @post.comments
  end

  def new
    @post = Post.find(params[:post_id])
    @comment = @post.comments.build
  end

  def edit
    @post = Post.find(params[:post_id])
    @comment = @post.comments.find(params[:id])
  end

  def create
    @post = Post.find(params[:post_id])
    @comment = @post.comments.build(params[:comment])
    if @comment.save
      redirect_to post_comment_url(@post,@comment)
    else
      render :action => "new"
    end
  end

  def update
    @post = Post.find(params[:post_id])
    @comment = Comment.find(params[:id])
    if @comment.update_attributes(params[:comment])
      redirect_to post_comment_url(@post, @comment)
    else
      render :action => "edit"
    end
  end

  def destroy
    @post = Post.find(params[:post_id])
    @comment = Comment.find(params[:id])
    @comment.destroy

    respond_to do |format|
      format.html { redirect_to post_comments_path(@post) }
      format.xml {head :ok}
    end
  end

end
</code>