Message ::TypeError: Cannot call method "GetJSON" of null

Hi, 

I have a Scheduler that execute this code :

// Define the Thing that contains the service
me.flag1 = 1;
// Call the service (e.g., GetAPIData) of the API Thing
Things["Eastern.SecurityVehiclesAPI.parser"].GetAPIData();
logger.warn("Tracking.API.Scheduler_3 subscriptionToCallTheService executed");
me.flag1 = 2;

 
and here is the service code itself 

//code
// API endpoint and headers

var apiUrl = "http://212.70.49.13/ewe.agent/api/v1/online-history/fleet/2100/all-vehicles";
var headers = {
 "Accept": "*/*",
 "Accept-Encoding": "gzip, deflate, br",
 "ApiKey": "xxxxx" // Replace with your actual API key
};
logger.warn("getapidata 2");

//var result = contentLoader.GetJSON(params);

// Make the HTTP GET request
 var result = Resources["ContentLoaderFunctions"].GetJSON({
 url: apiUrl,
 headers: headers,
 timeout: 10000 // Timeout in milliseconds
 });
logger.warn("getapidata 3");
 // Store the response in a property or return it
	me.APIResult = result;
	//logger.warn("API Response: " + JSON.stringify(result));

the service itself when i run it it works fine without any errors , but when the Scheduler runs it i get this error: 
Error in: Eastern.SecurityVehiclesAPI.parser.GetAPIData javascript service. Message ::TypeError: Cannot call method "GetJSON" of null (GetAPIData#15)

please note that this service and scheduler used to work on another platform and was fine so i am sure that the codes are correct, also both platforms run the same thingworx version 

so what might be wrong or even how to debug more for this one ?

thanks