[Radiant] Error when creating a new page

[kohlbauer]

Hello,

now I have intalled radiant and it works against the sql server. When I would like to create a new page I get that error:

NameError in Admin/page#new 
Showing admin/page/edit.rhtml where line #218 raised: 

C:/INFOSENSE/Programs/ruby/lib/ruby/gems/1.8/gems/radiant-0.6.3/vendor/rails/activerecord/lib/../../activesupport/lib/active_support/dependencies.rb:266:in `load_missing_constant': uninitialized constant NULLFilter
Extracted source (around line #218): 

215:   </div>
216:   <div class="popup" id="filter-reference-popup" style="display:none;">
217:     <h3><span id="filter-type"><%= default_filter_name %></span> Reference</h3>
218:     <div id="filter-reference"><%= filter_reference(default_filter_name) %></div>
219:     <p><%= link_to_function 'Close', "Element.hide('filter-reference-popup')", :class => 'close-link' %></p>
220:   </div>
221: <% end -%>
I don't think that this is a problem with the sql server. Any help available?best regardsklaus kohlbauer