DHTMLX connector support php 7 live server

[chrismart123]

Hi Im using Dhtmlx Scheduler, but seems i can connect to the live database, itried using the code below but its not working..

data.php
require_once(dirname(FILE).'/lib/dhtmlxScheduler/connector/scheduler_connector.php');
include('./config.php');
$scheduler = new JSONSchedulerConnector($res,$dbtype);
$roomtypes = new JSONOptionsConnector($res, "PDO");
$roomtypes->render_table("ns_room_types","idx","idx(value),room_name(label),name");
$scheduler->set_options("roomType", $roomtypes);

config.php
require_once(dirname(FILE).'/lib/dhtmlx_codebase/connector/db_pdo.php');
$dbtype = "PDO";
$res = new PDO("mysql:dbname=felladmin;host=localhost","xxx","xxx")

this is not displayig or retrieving any data, but if i tried this other code

// require_once('./lib/dhtmlx_codebase/connector/dataview_connector.php');
// $conn = new PDO("mysql:dbname=felladmin;host=localhost","felladmin","Fella@talamban");
// $data = new DataViewConnector($conn);
// $data->render_table("ns_room_types","idx","idx(value),room_name(label),name");

this retrieves data, why is the scheduler_connector not working? im working in the live server, but im my local seems to be working fine, hope to hear from you soon.