title: Magento system.xml and 404 error when trying to access the configuration panel
body: <p>I'm trying to implement some configuration settings for my custom module. I've managed to add a tab and a section in the left navigation bar. But when I want to open a section I get a 404 error page without any further information.</p>
  
  <p>So far, I've tried anything to get it working.. reading blogs, examples etc. but I can't find the error. Maybe someone of you can explain me what I'm doing wrong.</p>
  
  <p>My <code>adminhtml.xml</code>:</p>
  
  <pre><code>&lt;?xml version="1.0" ?&gt;
  &lt;config&gt;
      &lt;resources&gt;
          &lt;admin&gt;
              &lt;children&gt;
                  &lt;system&gt;
                      &lt;children&gt;
                          &lt;config&gt;
                              &lt;children&gt;
                                  &lt;tempest_section translate="title" module="Tempest"&gt;
                                      &lt;title&gt;Tempest&lt;/title&gt;
                                  &lt;/tempest_section&gt;
                              &lt;/children&gt;
                          &lt;/config&gt;
                      &lt;/children&gt;
                  &lt;/system&gt;
              &lt;/children&gt;
          &lt;/admin&gt;
      &lt;/resources&gt;
  &lt;/config&gt;
  </code></pre>
  
  <p>My <code>config.xml</code>:</p>
  
  <pre><code>&lt;?xml version="1.0"?&gt;
  
  &lt;config&gt;
      &lt;modules&gt;
          &lt;Polyvision_Tempest&gt;
              &lt;version&gt;0.1.0&lt;/version&gt;
          &lt;/Polyvision_Tempest&gt;
      &lt;/modules&gt;
  
  
      &lt;global&gt;
          &lt;helpers&gt;
              &lt;Tempest&gt;
                  &lt;class&gt;Polyvision_Tempest_Helper&lt;/class&gt;
              &lt;/Tempest&gt;  
          &lt;/helpers&gt;
      &lt;/global&gt;        
  
      &lt;admin&gt;
          &lt;routers&gt;
              &lt;adminhtml&gt;
                  &lt;args&gt;
                      &lt;modules&gt;
                          &lt;tempest before="Mage_Adminhtml"&gt;Polyvision_Tempest_Adminhtml&lt;/tempest&gt;
                      &lt;/modules&gt;
                  &lt;/args&gt;
              &lt;/adminhtml&gt;
          &lt;/routers&gt;
      &lt;/admin&gt;
  
  
      &lt;adminhtml&gt;
          &lt;menu&gt;
              &lt;menu1 translate="title" module="Tempest"&gt;
                  &lt;title&gt;polyvision&lt;/title&gt;
                  &lt;sort_order&gt;60&lt;/sort_order&gt;
                  &lt;children&gt;
                      &lt;menuitem1 module="Tempest"&gt;
                          &lt;title&gt;Tempest - Export&lt;/title&gt;
                          &lt;action&gt;adminhtml/tempest_main&lt;/action&gt;
                      &lt;/menuitem1&gt;
                  &lt;/children&gt;                
              &lt;/menu1&gt;
          &lt;/menu&gt;
      &lt;/adminhtml&gt;    
  
      &lt;default&gt;
          &lt;tempest&gt;
              &lt;settings&gt;
                  &lt;export_directory&gt;/tmp/&lt;/export_directory&gt;
              &lt;/settings&gt;
          &lt;/tempest&gt;
      &lt;/default&gt;
  &lt;/config&gt;
  </code></pre>
  
  <p>My <code>system.xml</code>:</p>
  
  <pre><code>&lt;?xml version="1.0" ?&gt;
  &lt;config&gt;
      &lt;tabs&gt;
          &lt;polyvision module="Tempest" translate="label"&gt;
              &lt;label&gt;polyvision&lt;/label&gt;
              &lt;sort_order&gt;100&lt;/sort_order&gt;
          &lt;/polyvision&gt;
      &lt;/tabs&gt;
      &lt;sections&gt;
          &lt;tempest_section module="Tempest" translate="label"&gt;
              &lt;label&gt;Tempest-Einstellungen&lt;/label&gt;
              &lt;sort_order&gt;200&lt;/sort_order&gt;
              &lt;show_in_default&gt;1&lt;/show_in_default&gt;
              &lt;show_in_website&gt;1&lt;/show_in_website&gt;
              &lt;show_in_store&gt;1&lt;/show_in_store&gt;
              &lt;tab&gt;polyvision&lt;/tab&gt;
              &lt;groups&gt;
                  &lt;settings translate="label"&gt;
                      &lt;label&gt;Settings&lt;/label&gt;
                      &lt;comment&gt;&lt;/comment&gt;
                      &lt;sort_order&gt;10&lt;/sort_order&gt;
                      &lt;show_in_default&gt;1&lt;/show_in_default&gt;
                      &lt;show_in_website&gt;1&lt;/show_in_website&gt;
                      &lt;show_in_store&gt;1&lt;/show_in_store&gt;
                      &lt;fields&gt;
                          &lt;export_directory translate="label tooltip comment"&gt;
                              &lt;label&gt;My Custom Field&lt;/label&gt;
                              &lt;comment&gt;Some comment about my field&lt;/comment&gt;
                              &lt;tooltip&gt;Field ToolTip&lt;/tooltip&gt;
                              &lt;show_in_default&gt;1&lt;/show_in_default&gt;
                              &lt;show_in_website&gt;1&lt;/show_in_website&gt;
                              &lt;show_in_store&gt;1&lt;/show_in_store&gt;
                          &lt;frontend_input&gt;text&lt;/frontend_input&gt;
                          &lt;source_model&gt;adminhtml/system_config_text&lt;/source_model&gt;
                      &lt;/export_directory&gt;
                  &lt;/fields&gt;
              &lt;/settings&gt;
          &lt;/groups&gt;
      &lt;/tempest_section&gt;
  &lt;/sections&gt;
  </code></pre>
  
  <p></p>
  
  <p>Well, my module itself works without hassles. Only the admin settings are not working :/</p>