Hi Folks,

I am trying to create the API which can fetch the data from Salesforce and send it to an external system. For that, I am using REST web services HttpGet.
Below is the code I am trying to write.

@RestResource(urlMapping='/api/*')
global with sharing class DetailsController{
   
    @HttpGet
    global static List<Wrapper1> getDetails() {
        RestRequest req = RestContext.request;
        RestResponse res = RestContext.response;
        
        string GO, ID;
        
		if(!string.isEmpty(req.params.get('GO'))){
			GON = req.params.get('GO');
		}
		else{
			throw new Utility.applicationException('GO Cannot be null');
		}
		
		if(!string.isEmpty(req.params.get('ID'))){
			UCMID = req.params.get('ID');
		}
		else{
			ID = '';
		}
        
        List<Wrapper1> Details = fetchDetails(GO, ID);
        return Details;
    }

The Wrapper1 hear is the Wrapper class which includes another wrapper class Wrapper2 in it.

Wrapper1

global class Wrapper1 {
    @AuraEnabled
    public string GO;
    @AuraEnabled
    public string Name;
    @AuraEnabled
    public string Address;
    @AuraEnabled
    public List<Wrapper2> Fsets;
    public class OrderTrackingDetail{
        @AuraEnabled public string Carrier=System.label.CCP_NotAvailableValue;
        @AuraEnabled public string TrackingID=System.label.CCP_NotAvailableValue;
        @AuraEnabled public string fSetNum;
        @AuraEnabled public string trackingURL;
    }
}

Wrapper2

public class Wrapper2 implements Comparable {
	
    public string addressCity;
    @AuraEnabled
    public string addressLine1;
    @AuraEnabled
    public string addressLine2;
    @AuraEnabled
    public string addressLise3;
    public string addressLine4;
    public string addressState;
    public string addressZip;
    public string Name;
    public string Country;
    @AuraEnabled
    public List<Object> object1 = new List<Object>();
    @AuraEnabled
    public List<Object> object2 = new List<Object>();
    public Integer compareTo(Object objToCompare) {
        integer val1 = integer.valueOf(//something);
        integer val2 = integer.valueOf(((Wrapper2)objToCompare).//something);
        if (val1 == val2) 
            return 0;
        if (val1 > val2) 
            return 1;
        return -1;
    }
}

When I am trying to write the gate method I am getting the below error.

Invalid type for Http* method: LIST.Wrapper1.LIST.Wrapper2.LIST.Object

How to solve this error.? Please help

Thanks
Nirav