KControllerExceptionResourceNotFound [404]

Category not found
.../components/com_docman/views/list/html.php:46
41             $category = $this->getModel()->create();
42             $category->title = $params->page_heading ? $params->page_heading : $this->getActiveMenu()->title;
43         }
44 
45         if ($state->isUnique() && $category->isNew()) {
46             throw new KControllerExceptionResourceNotFound('Category not found');
47         }
48 
49         //Subcategories
50         if ($params->show_subcategories)
51         {