When I'm trying to setup base query in NestedSet? tree:

        $categoriesTable = Doctrine::getTable('Default_WebsiteCathegories');
        $base_query = Doctrine_Query::create()
            ->from('Default_WebsiteCathegories c')
            ->setHydrationMode(Doctrine::HYDRATE_ARRAY);

        $categoriesTreeObject = $categoriesTable->getTree();
        $categoriesTreeObject->setBaseQuery($base_query);
        $cathegoriesArray = $categoriesTreeObject->fetchTree();

Exception is being raised:

exception 'Doctrine_Query_Exception' with message 'Duplicate alias 'c' in query.'