Switch2: Gate index 0 out of range when accessing vector gate 'ethgIn[]' with size 0

[dhiiiinnn7]

Hi
I am getting an error on my first simulation project using INET and some custom-made modules stating Switch2: Gate index 0 out of range when accessing vector gate 'ethgIn[]' with size 0, Please find the attached NED file for program details. I would appreciate if this error could resolved as I am working on my FINAL YEAR PROJECT on Ransomware Detection and Mitigation for Smart Business Management System IoT Network.

.ned file

package sbms.simulations;
import inet.networklayer.configurator.ipv4.Ipv4NetworkConfigurator;
import inet.node.inet.Router;
import inet.node.ethernet.EthernetSwitch;
import inet.node.inet.StandardHost;
import inet.visualizer.canvas.integrated.IntegratedCanvasVisualizer;
import inet.physicallayer.wireless.ieee80211.packetlevel.Ieee80211ScalarRadioMedium;
import inet.node.ethernet.Eth100M;
import ned.IdealChannel;

module router extends Router
{
    gates:
        input ethgIn[];
        output ethgOut[];
}

module Switch extends EthernetSwitch
{
    gates:
        input ethgIn[];
        output ethgOut[];
}

module Firewall
{
    gates:
        input ethgIn;
        output ethgOut;
}

module IoTDevice extends StandardHost
{
    gates:
        input ethgIn;
        //output ethgOut;
}

module RansomwareHost
{
    parameters:
        double sendInterval;
    gates:
        output ethgOut; 
}

network SBMS
{
    @display("bgb=10000,10000,white");
    submodules:

        configurator: Ipv4NetworkConfigurator {
            @display("p=103.09,54.079998");
        }

        radioMedium: Ieee80211ScalarRadioMedium {
            @display("p=427.56998,52.39");
        }

        visualizer: IntegratedCanvasVisualizer {
            @display("p=270.4,54.079998");
        }

        backbonerouter: router {
            @display("p=2036.3992,1290.9572;i=abstract/router2");
        }

        Router1: router {
            @display("p=1470.8914,1290.9572");
        }

        Router2: router {
            @display("p=2707.5828,1290.9572");
        }

        Switch1: Switch {
            @display("p=559.725,1712.1");
        }

        Switch2: Switch {
        @display("p=2958.9194,1085.318");
        }

        firewall: Firewall {
            @display("p=1772.4624,751.7875;i=device/firewall");
        }

        RansomwareHost: RansomwareHost {
            @display("p=3830.275,455.4625;i=old/comp_a");
        }

        TemparatureSensor: IoTDevice {
            @display("i=misc/temperaturesensor;p=631.19806,454.11987;is=s");
        }

    connections:
    // Connect RansomwareHost's output to Switch2's input
    RansomwareHost.ethgOut --> Eth100M --> Switch2.ethgIn[0];

    // Connect Switch2's output to Router2's input
    Switch2.ethgOut[0] --> Eth100M --> Router2.ethgIn[0];

    // Connect Router2's output to the backbonerouter's input
    Router2.ethgOut[0] --> Eth100M --> backbonerouter.ethgIn[0];

    // Connect backbonerouter's output to Router1's input
    backbonerouter.ethgOut[0] --> Eth100M --> Router1.ethgIn[0];

    // Connect Router1's output to Switch1's input
    Router1.ethgOut[0] --> Eth100M --> Switch1.ethgIn[0];

    // Connect Switch1's output to the firewall's input
    Switch1.ethgOut[0] --> Eth100M --> firewall.ethgIn;

    // Connect firewall's output to TemperatureSensor's input
    firewall.ethgOut --> Eth100M --> TemparatureSensor.ethgIn;
}
```