strange undefined method

[acrylik]

ok I am trying to go throught the ruby/rails tutorial on the appl site (http://developer.apple.com/tools/rubyonrails.html), but when I get to the "business logic" it won't work. For my expenses_helper.rb I have

module ExpensesHelper
  def total(account)
    style = account.total_expenses > account.budget ? 'color: red' : 'color: black'
    %(<span style="#{style}">#{number_to_currency(account.total_expenses)}</span>)
  end
end

for my app/models/account.rb file I have,

def total_expenses
  expenses.inject(0) {|total, expense| total + expense.amount }
end

and for my show.rhtml I have

<% 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' %>


<% if @account.has_expenses? %>
  <h3>Itemized Expenses</h3>
  <table>
  <% for expense in @account.expenses %>
    <tr>
      <td><%= expense.paid_on %></td>
      <td><%= expense.payable_to %></td>
      <td align="right"><%= number_to_currency(expense.amount) %></td>
    </tr>

  <% end %>
	<tr>
	  <td align="right" colspan="3">
	    <strong>Total</strong>: <%= total(@account) %>
	  </td>
	</tr>
  </table>

<% end %>



<%= start_form_tag :action => 'record', :id => @account %>
  <p>
    On <%= date_select 'expense', 'paid_on', :order => [:month, :day, :year] %>
    to <%= text_field 'expense', 'payable_to', :size => 25 %>
    in the amount of $<%= text_field 'expense', 'amount', :size => 9 %>
  </p>
  <%= submit_tag 'Record!' %>
<%= end_form_tag %>

This is, I believe, exactly how the tutorial says to do it, yet I keep getting

 NoMethodError in Expenses#show

Showing app/views/expenses/show.rhtml where line #24 raised:

private method `total_expenses' called for #<Account:0x229a8e4>

Extracted source (around line #24):

21:   <% end %>
22: 	<tr>
23: 	  <td align="right" colspan="3">
24: 	    <strong>Total</strong>: <%= total(@account) %>
25: 	  </td>
26: 	</tr>
27:   </table>

RAILS_ROOT: script/../config/..
Application Trace | Framework Trace | Full Trace

/usr/local/lib/ruby/gems/1.8/gems/activerecord-1.14.2/lib/active_record/base.rb:1792:in `method_missing'
#{RAILS_ROOT}/app/helpers/expenses_helper.rb:3:in `total'
#{RAILS_ROOT}/app/views/expenses/show.rhtml:24:in `_run_rhtml_expenses_show'

/usr/local/lib/ruby/gems/1.8/gems/activerecord-1.14.2/lib/active_record/base.rb:1792:in `method_missing'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action_view/base.rb:314:in `compile_and_render_template'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action_view/base.rb:290:in `render_template'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action_view/base.rb:249:in `render_file'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action_controller/base.rb:699:in `render_file'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action_controller/base.rb:621:in `render_with_no_layout'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action_controller/layout.rb:243:in `render_without_benchmark'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action_controller/benchmarking.rb:53:in `render'
/usr/local/lib/ruby/1.8/benchmark.rb:293:in `measure'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action_controller/benchmarking.rb:53:in `render'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action_controller/base.rb:911:in `perform_action_without_filters'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action_controller/filters.rb:368:in `perform_action_without_benchmark'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action_controller/benchmarking.rb:69:in `perform_action_without_rescue'
/usr/local/lib/ruby/1.8/benchmark.rb:293:in `measure'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action_controller/benchmarking.rb:69:in `perform_action_without_rescue'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action_controller/rescue.rb:82:in `perform_action'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action_controller/base.rb:381:in `process_without_filters'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action_controller/filters.rb:377:in `process_without_session_management_support'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action_controller/session_management.rb:117:in `process'
/usr/local/lib/ruby/gems/1.8/gems/rails-1.1.2/lib/dispatcher.rb:38:in `dispatch'
/usr/local/lib/ruby/gems/1.8/gems/rails-1.1.2/lib/webrick_server.rb:115:in `handle_dispatch'
/usr/local/lib/ruby/gems/1.8/gems/rails-1.1.2/lib/webrick_server.rb:81:in `service'
/usr/local/lib/ruby/1.8/webrick/httpserver.rb:104:in `service'
/usr/local/lib/ruby/1.8/webrick/httpserver.rb:65:in `run'
/usr/local/lib/ruby/1.8/webrick/server.rb:173:in `start_thread'
/usr/local/lib/ruby/1.8/webrick/server.rb:162:in `start_thread'
/usr/local/lib/ruby/1.8/webrick/server.rb:95:in `start'
/usr/local/lib/ruby/1.8/webrick/server.rb:92:in `start'
/usr/local/lib/ruby/1.8/webrick/server.rb:23:in `start'
/usr/local/lib/ruby/1.8/webrick/server.rb:82:in `start'
/usr/local/lib/ruby/gems/1.8/gems/rails-1.1.2/lib/webrick_server.rb:67:in `dispatch'
/usr/local/lib/ruby/gems/1.8/gems/rails-1.1.2/lib/commands/servers/webrick.rb:59
/usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:21:in `require'
/usr/local/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:147:in `require'
/usr/local/lib/ruby/gems/1.8/gems/rails-1.1.2/lib/commands/server.rb:30
/usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:21:in `require'
/usr/local/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:147:in `require'
script/server:3

/usr/local/lib/ruby/gems/1.8/gems/activerecord-1.14.2/lib/active_record/base.rb:1792:in `method_missing'
#{RAILS_ROOT}/app/helpers/expenses_helper.rb:3:in `total'
#{RAILS_ROOT}/app/views/expenses/show.rhtml:24:in `_run_rhtml_expenses_show'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action_view/base.rb:314:in `compile_and_render_template'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action_view/base.rb:290:in `render_template'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action_view/base.rb:249:in `render_file'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action_controller/base.rb:699:in `render_file'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action_controller/base.rb:621:in `render_with_no_layout'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action_controller/layout.rb:243:in `render_without_benchmark'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action_controller/benchmarking.rb:53:in `render'
/usr/local/lib/ruby/1.8/benchmark.rb:293:in `measure'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action_controller/benchmarking.rb:53:in `render'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action_controller/base.rb:911:in `perform_action_without_filters'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action_controller/filters.rb:368:in `perform_action_without_benchmark'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action_controller/benchmarking.rb:69:in `perform_action_without_rescue'
/usr/local/lib/ruby/1.8/benchmark.rb:293:in `measure'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action_controller/benchmarking.rb:69:in `perform_action_without_rescue'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action_controller/rescue.rb:82:in `perform_action'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action_controller/base.rb:381:in `process_without_filters'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action_controller/filters.rb:377:in `process_without_session_management_support'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action_controller/session_management.rb:117:in `process'
/usr/local/lib/ruby/gems/1.8/gems/rails-1.1.2/lib/dispatcher.rb:38:in `dispatch'
/usr/local/lib/ruby/gems/1.8/gems/rails-1.1.2/lib/webrick_server.rb:115:in `handle_dispatch'
/usr/local/lib/ruby/gems/1.8/gems/rails-1.1.2/lib/webrick_server.rb:81:in `service'
/usr/local/lib/ruby/1.8/webrick/httpserver.rb:104:in `service'
/usr/local/lib/ruby/1.8/webrick/httpserver.rb:65:in `run'
/usr/local/lib/ruby/1.8/webrick/server.rb:173:in `start_thread'
/usr/local/lib/ruby/1.8/webrick/server.rb:162:in `start_thread'
/usr/local/lib/ruby/1.8/webrick/server.rb:95:in `start'
/usr/local/lib/ruby/1.8/webrick/server.rb:92:in `start'
/usr/local/lib/ruby/1.8/webrick/server.rb:23:in `start'
/usr/local/lib/ruby/1.8/webrick/server.rb:82:in `start'
/usr/local/lib/ruby/gems/1.8/gems/rails-1.1.2/lib/webrick_server.rb:67:in `dispatch'
/usr/local/lib/ruby/gems/1.8/gems/rails-1.1.2/lib/commands/servers/webrick.rb:59
/usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:21:in `require'
/usr/local/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:147:in `require'
/usr/local/lib/ruby/gems/1.8/gems/rails-1.1.2/lib/commands/server.rb:30
/usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:21:in `require'
/usr/local/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:147:in `require'
script/server:3

Request

Parameters: {"id"=>"1"}

Show session dump

--- 
flash: !map:ActionController::Flash::FlashHash {}


Response
Headers: {"cookie"=>[], "Cache-Control"=>"no-cache"}

Any ideas? I think it might have to do with not finding the method or the method total() being private. I hope I don't have anything wrong with my ruby/rails install. Thanks a million!