Rails - Mar 2011 - Problems with viewing my calendar

Hey dudes,

i''m trying to build a small calendar into my app. I follow the steps
shown in http://railscasts.com/episodes/213-calendars, so i go with the
table_builder gem, which allows to use the calendar_for command. But
unfortunately it doesnt work or rather show the results in my
view-template. I even got no error-message.
It only shows this: (twice!!?!)

Calendar
< March 2011 >
<th>Sonntag</th><th>Montag</th><th>Dienstag</th><th>Mittwoch</th><th>Donnerstag</th><th>Freitag</th><th>Samstag</th><th>Sonntag</th><th>Montag</th><th>Dienstag</th><th>Mittwoch</th><th>Donnerstag</th><th>Freitag</th><th>Samstag</th>


Ok here''s my Code (btw. i use Rails 3.0.4 and 1.8.7-p330):

Controller:
----------
class MycalendarController < ApplicationController
  def month
    @visitors = Visitor.all
    @date = params[:month] ? Date.parse(params[:month]) : Date.today
  end
end
------------

View:
------------
<h1>Calendar</h1>

<div id="calendar">
  <h2 id="month">
    <%= link_to "<", :month =>
(@date.beginning_of_month-1).strftime("%Y/%m") %>
    <%=h @date.strftime("%B %Y") %>
    <%= link_to ">", :month =>
(@date.end_of_month+1).strftime("%Y/%m")
%>
  </h2>
  <% calendar_for(@visitors, :year => @date.year, :month =>
@date.month)
do |calendar| %>
    <%= calendar.head(''Sonntag'',
''Montag'', ''Dienstag'',
''Mittwoch'',
''Donnerstag'',''Freitag'',''Samstag'')
%>
    <% calendar.day(:day_method => :datum) do |date, visitors| %>
      <%= date.day %>
        <ul>
          <% for visitor in visitors%>
          <li><%= link_to (visitor.name), :controller =>
''visitor''
%></li>
          <% end %>
        </ul>
    <% end %>
  <% end %>
</div>
-----------------

I hope u can help me out of this misery.

Thanks in advance for any suggestions.

Regards, Andreas

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