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' => '5rIDdfXC', 'idsite' => 1, 'context' => 'web', 'name' => 'test', 'description' => 'just test', 'status' => 'active', 'created_date' => '2021-02-06 12:36:52', 'updated_date' => '2021-02-06 12:36:52', 'created_date_pretty' => 'Feb 6, 2021 14:36:52', 'updated_date_pretty' => 'Feb 6, 2021 14:36:52', 'versions' => array ( ), 'releases' => array ( ), 'draft' => array ( 'idcontainerversion' => 1, 'idcontainer' => '5rIDdfXC', 'idsite' => 1, 'status' => 'active', 'revision' => 0, 'name' => '', 'description' => '', 'created_date' => '2021-02-06 12:36:52', 'updated_date' => '2021-02-06 12:36:52', 'created_date_pretty' => 'Feb 6, 2021 14:36:52', 'updated_date_pretty' => 'Feb 6, 2021 14:36:52', ), ), );