Error: Data structure returned is not convertible in the requested format. Try to call this method with the parameters '&format=original&serialize=1'; you will get the original php data structure serialized. The data structure looks like this: $data = array ( 0 => array ( 'name' => 'Dashboard', 'id' => 1, 'widgets' => array ( 0 => array ( 'module' => 'Live', 'action' => 'widget', ), 1 => array ( 'module' => 'CoreHome', 'action' => 'getPromoVideo', ), 2 => array ( 'module' => 'VisitsSummary', 'action' => 'getEvolutionGraph', ), 3 => array ( 'module' => 'VisitsSummary', 'action' => 'get', ), 4 => array ( 'module' => 'UserCountryMap', 'action' => 'visitorMap', ), 5 => array ( 'module' => 'Referrers', 'action' => 'getReferrerType', ), 6 => array ( 'module' => 'RssWidget', 'action' => 'rssPiwik', ), ), ), );