title: Getting error in manage categories - not found for attribute "navigation_column"
body: <p>After trying to install one extension and trying to uninstall, deleting all their files (extension) - we are now getting errors when trying to go in <code>admin &gt; manage categories</code>:</p>
  
  <pre><code>Source model "gomage_navigation/adminhtml_system_config_source_category_column" not found for attribute "navigation_column"
  
  Trace:
  #0 /home/vinylshop/domains/vinylshop.lt/public_html/app/code/core/Mage/Eav/Model/Entity/Attribute/Abstract.php(387): Mage::exception('Mage_Eav', 'Source model "g...')
  #1 /home/vinylshop/domains/vinylshop.lt/public_html/app/code/core/Mage/Adminhtml/Block/Widget/Form.php(201): Mage_Eav_Model_Entity_Attribute_Abstract-&gt;getSource()
  #2 /home/vinylshop/domains/vinylshop.lt/public_html/app/code/core/Mage/Adminhtml/Block/Catalog/Category/Tab/Attributes.php(113): Mage_Adminhtml_Block_Widget_Form-&gt;_setFieldset(Array, Object(Varien_Data_Form_Element_Fieldset))
  #3 /home/vinylshop/domains/vinylshop.lt/public_html/app/code/core/Mage/Adminhtml/Block/Widget/Form.php(144): Mage_Adminhtml_Block_Catalog_Category_Tab_Attributes-&gt;_prepareForm()
  #4 /home/vinylshop/domains/vinylshop.lt/public_html/app/code/core/Mage/Core/Block/Abstract.php(862): Mage_Adminhtml_Block_Widget_Form-&gt;_beforeToHtml()
  #5 /home/vinylshop/domains/vinylshop.lt/public_html/app/code/core/Mage/Adminhtml/Block/Catalog/Category/Tabs.php(140): Mage_Core_Block_Abstract-&gt;toHtml()
  #6 /home/vinylshop/domains/vinylshop.lt/public_html/app/code/core/Mage/Core/Block/Abstract.php(238): Mage_Adminhtml_Block_Catalog_Category_Tabs-&gt;_prepareLayout()
  #7 /home/vinylshop/domains/vinylshop.lt/public_html/app/code/core/Mage/Core/Model/Layout.php(430): Mage_Core_Block_Abstract-&gt;setLayout(Object(Mage_Core_Model_Layout))
  #8 /home/vinylshop/domains/vinylshop.lt/public_html/app/code/core/Mage/Adminhtml/Block/Catalog/Category/Edit/Form.php(55): Mage_Core_Model_Layout-&gt;createBlock('adminhtml/catal...', 'tabs')
  #9 /home/vinylshop/domains/vinylshop.lt/public_html/app/code/core/Mage/Core/Block/Abstract.php(238): Mage_Adminhtml_Block_Catalog_Category_Edit_Form-&gt;_prepareLayout()
  #10 /home/vinylshop/domains/vinylshop.lt/public_html/app/code/core/Mage/Core/Model/Layout.php(430): Mage_Core_Block_Abstract-&gt;setLayout(Object(Mage_Core_Model_Layout))
  #11 /home/vinylshop/domains/vinylshop.lt/public_html/app/code/core/Mage/Adminhtml/Block/Widget/Form/Container.php(82): Mage_Core_Model_Layout-&gt;createBlock('adminhtml/catal...')
  #12 /home/vinylshop/domains/vinylshop.lt/public_html/app/code/core/Mage/Core/Block/Abstract.php(238): Mage_Adminhtml_Block_Widget_Form_Container-&gt;_prepareLayout()
  #13 /home/vinylshop/domains/vinylshop.lt/public_html/app/code/core/Mage/Core/Model/Layout.php(430): Mage_Core_Block_Abstract-&gt;setLayout(Object(Mage_Core_Model_Layout))
  #14 /home/vinylshop/domains/vinylshop.lt/public_html/app/code/core/Mage/Core/Model/Layout.php(446): Mage_Core_Model_Layout-&gt;createBlock('adminhtml/catal...', 'category.edit')
  #15 /home/vinylshop/domains/vinylshop.lt/public_html/app/code/core/Mage/Core/Model/Layout.php(238): Mage_Core_Model_Layout-&gt;addBlock('adminhtml/catal...', 'category.edit')
  #16 /home/vinylshop/domains/vinylshop.lt/public_html/app/code/core/Mage/Core/Model/Layout.php(204): Mage_Core_Model_Layout-&gt;_generateBlock(Object(Mage_Core_Model_Layout_Element), Object(Mage_Core_Model_Layout_Element))
  #17 /home/vinylshop/domains/vinylshop.lt/public_html/app/code/core/Mage/Core/Model/Layout.php(209): Mage_Core_Model_Layout-&gt;generateBlocks(Object(Mage_Core_Model_Layout_Element))
  #18 /home/vinylshop/domains/vinylshop.lt/public_html/app/code/core/Mage/Core/Controller/Varien/Action.php(345): Mage_Core_Model_Layout-&gt;generateBlocks()
  #19 /home/vinylshop/domains/vinylshop.lt/public_html/app/code/core/Mage/Core/Controller/Varien/Action.php(270): Mage_Core_Controller_Varien_Action-&gt;generateLayoutBlocks()
  #20 /home/vinylshop/domains/vinylshop.lt/public_html/app/code/core/Mage/Adminhtml/Controller/Action.php(263): Mage_Core_Controller_Varien_Action-&gt;loadLayout(NULL, true, true)
  #21 /home/vinylshop/domains/vinylshop.lt/public_html/app/code/core/Mage/Adminhtml/controllers/Catalog/CategoryController.php(191): Mage_Adminhtml_Controller_Action-&gt;loadLayout()
  #22 /home/vinylshop/domains/vinylshop.lt/public_html/app/code/core/Mage/Core/Controller/Varien/Action.php(420): Mage_Adminhtml_Catalog_CategoryController-&gt;editAction()
  #23 /home/vinylshop/domains/vinylshop.lt/public_html/app/code/core/Mage/Core/Controller/Varien/Router/Standard.php(250): Mage_Core_Controller_Varien_Action-&gt;dispatch('edit')
  #24 /home/vinylshop/domains/vinylshop.lt/public_html/app/code/core/Mage/Core/Controller/Varien/Front.php(176): Mage_Core_Controller_Varien_Router_Standard-&gt;match(Object(Mage_Core_Controller_Request_Http))
  #25 /home/vinylshop/domains/vinylshop.lt/public_html/app/code/core/Mage/Core/Model/App.php(349): Mage_Core_Controller_Varien_Front-&gt;dispatch()
  #26 /home/vinylshop/domains/vinylshop.lt/public_html/app/Mage.php(640): Mage_Core_Model_App-&gt;run(Array)
  #27 /home/vinylshop/domains/vinylshop.lt/public_html/index.php(80): Mage::run('', 'store')
  #28 {main}
  </code></pre>