Sparkplug B with MQTT in C# -> MQTT Broker connection not working as expected

Question

https://github.com/SeppPenner/SparkplugNet/blob/master/HowToUse.md

I have explored the above link and implemented the sample solution for sparkplug B with MQTT (sender and receiver).

But when I am executing the below methods I am getting a "Null reference" exception.

1. RunVersionBApplication (Receiver)
2. RunVersionBNode (sender)

Note :

• If I am passing the primary application as false code working fine.

• But If I am passing the primary application property as true I am getting below exception.

   var nodeOptions = new SparkplugNodeOptions("localhost", 1883, "client", "", "", **false**, "scada", groupId, edgeNodeId, TimeSpan.FromSeconds(130), null, null, null);

  await node.Start(nodeOptions);

System. NullReferenceException HResult=0x80004003 Message= Object reference not set to an instance of an object . Source=SparkplugNet
StackTrace: at SparkplugNet.Core.Application.SparkplugApplicationBase1.< ConnectInternal >d__34.MoveNext() at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()

Please help me to resolve this issue!