Error: Data structure returned is not convertible in the requested format: Only integer keys supported for array columns on base level. Unsupported string '묻지마 검색' found for row 'array (
  0 => 
  array (
    'url' => 'kwzf.net',
    'parameters' => 'search',
    'backlink' => '#search={k}',
    'charset' => '',
  ),
)'. Try to call this method with the parameters '&format=original&serialize=1'; you will get the original php data structure serialized.