お世話になっております。佐藤です。
三浦さんのやり方で、listの表示は出来ていたのですが、Edit, Show を表示す
ると、下記のようなエラーが発生してしまいました。
他のプロジェクトのファイルを見ても、うまくいっているファイルと同じように
見えているので、何か別の設定が必要なのかなと思っているのですが、どうなの
でしょうか？
よろしくお願い致します。

--------account_controller.rb-------------------------------------------

class AccountController < ApplicationController
  def index
    list
    render :action => 'list'
  end

  # GETs should be safe (see http://www.w3.org/2001/tag/doc/whenToUseGet.html)
  verify :method => :post, :only => [ :destroy, :create, :update ],
         :redirect_to => { :action => :list }

  def list
    @account_pages, @account = paginate :account, :per_page => 10
  end

  def show
    @account = Account.find(params[:id])
  end

  def new
    @account = Account.new
  end

  def create
    @account = Account.new(params[:account])
    if @account.save
      flash[:notice] = 'Account was successfully created.'
      redirect_to :action => 'list'
    else
      render :action => 'new'
    end
  end

  def edit
    @account = Account.find(params[:id])
  end

  def update
    @account = Account.find(params[:id])
    if @account.update_attributes(params[:account])
      flash[:notice] = 'Account was successfully updated.'
      redirect_to :action => 'show', :id => @account
    else
      render :action => 'edit'
    end
  end

  def destroy
    Account.find(params[:id]).destroy
    redirect_to :action => 'list'
  end
end


--------------------edit.rhtml-------------------------------------------
<h1>Editing account</h1>

<%= start_form_tag :action => 'update', :id => @account %>
  <%= render :partial => 'form' %>
  <%= submit_tag 'Edit' %>
<%= end_form_tag %>

<%= link_to 'Show', :action => 'show', :id => @account %> |
<%= link_to 'Back', :action => 'list' %>

--------------------show.rhtml-------------------------------------------
<% for column in Account.content_columns %>
<p>
  <b><%= column.human_name %>:</b> <%=h @account.send(column.name) %>
</p>
<% end %>

<%= link_to 'Edit', :action => 'edit', :id => @account %> |
<%= link_to 'Back', :action => 'list' %>

--------------------show error-------------------------------------------
Couldn't find Account without an ID

/usr/local/lib/ruby/gems/1.8/gems/activerecord-1.14.4/lib/active_record/base.rb:939:in
`find_from_ids'
/usr/local/lib/ruby/gems/1.8/gems/activerecord-1.14.4/lib/active_record/base.rb:382:in `find'
app/controllers/account_controller.rb:16:in `show'

--------------------edit error-------------------------------------------
Couldn't find Account without an ID

/usr/local/lib/ruby/gems/1.8/gems/activerecord-1.14.4/lib/active_record/base.rb:939:in
`find_from_ids'
/usr/local/lib/ruby/gems/1.8/gems/activerecord-1.14.4/lib/active_record/base.rb:382:in `find'
app/controllers/account_controller.rb:34:in `edit'



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