Error Loading Messages using Wialon Remote API - php

Question

We have several GPS installed in different units and I am trying to retrieve the messages using the Wialon's Remote API but i am getting this error, can someone please help me? Thanks a lot!:
{"error":4, "reason":"VALIDATE_PARAMS_ERROR: {itemId: long, timeFrom: uint, timeTo: uint, flags: uint, flagsMask: uint, loadCount: uint}"}
Below is my script:
<?php
include('wialon.php');
$wialon_api = new Wialon();
$token = '{token here}';
$result = $wialon_api->login($token);
$json = json_decode($result, true);
if(!isset($json['error'])){
echo $wialon_api->messages_load_interval('{"itemId":24611387,"lastTime":1073741831,"lastCount":1,"flags":0,"flagMask":0,"loadCount":1}');
$wialon_api->logout();
} else {
echo WialonError::error($json['error']);
}
?>
Here is the Wialon Class which i downloaded from their site:
<?php
/* Classes for working with Wialon RemoteApi using PHP
*
* License:
* The MIT License (MIT)
*
* Copyright:
* 2002-2015 Gurtam, http://gurtam.com
*/
/** Wialon RemoteApi wrapper Class
*/
class Wialon{
/// PROPERTIES
private $sid = null;
private $base_api_url = '';
private $default_params = array();
/// METHODS
/** constructor */
function __construct($scheme = 'https', $host = 'hst-api.wialon.com', $port = '', $sid = '', $extra_params = array()) {
$this->sid = '';
$this->default_params = array_replace(array(), (array)$extra_params);
$this->base_api_url = sprintf('%s://%s%s/wialon/ajax.html?', $scheme, $host, mb_strlen($port)>0?':'.$port:'');
}
/** sid setter */
function set_sid($sid){
$this->sid = $sid;
}
/** sid getter */
function get_sid(){
return $this->sid;
}
/** update extra parameters */
public function update_extra_params($extra_params){
$this->default_params = array_replace($this->default_params, $extra_params);
}
/** RemoteAPI request performer
* action - RemoteAPI command name
* args - JSON string with request parameters
*/
public function call($action, $args){
$url = $this->base_api_url;
if (stripos($action, 'unit_group') === 0) {
$svc = $action;
$svc[mb_strlen('unit_group')] = '/';
} else {
$svc = preg_replace('\'_\'', '/', $action, 1);
}
$params = array(
'svc'=> $svc,
'params'=> $args,
'sid'=> $this->sid
);
$all_params = array_replace($this->default_params , $params);
$str = '';
foreach ($all_params as $k => $v) {
if(mb_strlen($str)>0)
$str .= '&';
$str .= $k.'='.urlencode(is_object($v) || is_array($v) ? json_encode($v) : $v);
}
/* cUrl magic */
$ch = curl_init();
$options = array(
CURLOPT_URL => $url,
CURLOPT_RETURNTRANSFER => 1,
CURLOPT_POST => 1,
CURLOPT_POSTFIELDS => $str
);
curl_setopt_array($ch, $options);
$result = curl_exec($ch);
if($result === FALSE)
$result = '{"error":-1,"message":'.curl_error($ch).'}';
curl_close($ch);
return $result;
}
/** Login
* user - wialon username
* password - password
* return - server response
*/
public function login($token) {
$data = array(
'token' => urlencode($token),
);
$result = $this->token_login(json_encode($data));
$json_result = json_decode($result, true);
if(isset($json_result['eid'])) {
$this->sid = $json_result['eid'];
}
return $result;
}
/** Logout
* return - server responce
*/
public function logout() {
$result = $this->core_logout();
$json_result = json_decode($result, true);
if($json_result && $json_result['error']==0)
$this->sid = '';
return $result;
}
/** Unknonwn methods hadler */
public function __call($name, $args) {
return $this->call($name, count($args) === 0 ? '{}' : $args[0]);
}
}
/** Wialon errorCode to textMessage converter
*/
class WialonError{
/// PROPERTIES
/** list of error messages with codes */
public static $errors = array(
1 => 'Invalid session',
2 => 'Invalid service',
3 => 'Invalid result',
4 => 'Invalid input',
5 => 'Error performing request',
6 => 'Unknow error',
7 => 'Access denied',
8 => 'Invalid user name or password',
9 => 'Authorization server is unavailable, please try again later',
1001 => 'No message for selected interval',
1002 => 'Item with such unique property already exists',
1003 => 'Only one request of given time is allowed at the moment'
);
/// METHODS
/** error message generator */
public static function error($code = '', $text = ''){
$code = intval($code);
if ( isset(self::$errors[$code]) )
$text = self::$errors[$code].' '.$text;
$message = sprintf('%d: %s', $code, $text);
return sprintf('WialonError( %s )', $message);
}
}
?>