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 (
    'idcontainer' => 'cZ0jeW8I',
    'idsite' => 37,
    'context' => 'web',
    'name' => 'test',
    'description' => 'test',
    'status' => 'active',
    'created_date' => '2022-03-01 09:38:23',
    'updated_date' => '2022-03-01 09:38:23',
    'created_date_pretty' => 'Mar 1, 2022 10:38:23',
    'updated_date_pretty' => 'Mar 1, 2022 10:38:23',
    'versions' => 
    array (
    ),
    'releases' => 
    array (
    ),
    'draft' => 
    array (
      'idcontainerversion' => 6,
      'idcontainer' => 'cZ0jeW8I',
      'idsite' => 37,
      'status' => 'active',
      'revision' => 0,
      'name' => '',
      'description' => '',
      'created_date' => '2022-03-01 09:38:23',
      'updated_date' => '2022-03-01 09:38:23',
      'created_date_pretty' => 'Mar 1, 2022 10:38:23',
      'updated_date_pretty' => 'Mar 1, 2022 10:38:23',
    ),
  ),
);