I am new to OMNET++ and I have the following problem:

1. I am trying to create a network with 3 nodes that communicate wirelessly.
2. My project contains these files -> Network.ned , CustNetworkNode.ned , Maclayer.ned/.cc/.h and omnetpp.ini
3. The code of the CustomNetwork.ned file :

package customproject;

import inet.queueing.queue.DropTailQueue;
import inet.applications.common.SinkApp;
import inet.applications.common.SourceApp;
import inet.physicallayer.wireless.common.contract.packetlevel.IRadio;
import inet.mobility.contract.IMobility;

module CustNetworkNode
{
    parameters:
        radio.antenna.mobilityModule = default("^.^.^.mobility");

    gates:
        input radioIn @directIn;

    submodules:
        radio: <default("UnitDiskRadio")> like IRadio {
            @display("p=199.42,621.92");
        }
        mac: Maclayer {
            @display("p=199.42,441.09");
        }
        queue: DropTailQueue {
            @display("p=200,300");
        }
        traffic_gen: SourceApp {
            @display("p=199.42,104.78");
        }
        consumer: SinkApp {
            @display("p=332.93,104.78");
        }
        mobility: <default("StationaryMobility")> like IMobility {

            @display("p=58.5,117");
        }
    connections allowunconnected:
        radioIn --> { @display("m=s"); } --> radio.radioIn;
        radio.upperLayerOut --> mac.lowerLayerIn;
        radio.upperLayerIn <-- mac.lowerLayerOut;
        queue.out --> mac.upperLayerIn;
        queue.in <-- traffic_gen.socketOut;
        mac.upperLayerOut --> consumer.socketIn;
}

4. When I run the omnetpp.ini file I’am getting this
   #Error

5. Then I go back to the comment the CustomNetwork.ned file and comment the line:
   //radio.antenna.mobilityModule = default("^.^.^.mobility");

6. After running the omnetpp.ini file again I’m getting this Unassigned Parameter

7. I don’t sign any parameter and I get the following #Error

I have read a relevant topic with someone that faced the same issues but I cannot find any solid answer that solves these problems.
Omnet++ simple wireless node

Any recommendations?

I executed the steps 4-7