Akka.Extensions | Akka.Net integrate with Microsoft.Extensions

I created simple application using scala,akka,maven with Intellij Idea and I created fat jar of my application, I tried to run jar with below command

java -jar bac-pqr.jar -Dconfig.file=/home/pqr-xvcx-xcvxv-sdf/application.conf -Dconfig.trace=loads

I am getting below error while running the jar through command prompt:

I'm trying to make distributed pub-sub across different cluster system but it's not working whatever i try.

All I'm trying to do is create a simple example where.

1) I create a topic, say "content".

2) One node in say jvm A creates the topic, subscribes to it, and a publisher who publishes to it too.

3) In a different node , say jvm B on a different port , I create a subscriber.

4) When i sent a message to the topic from jvm A, then I want the subscriber on jvm B to receive it too as its subscribed to the same topic.

Any helps would be greatly appreciated or a simple working example of distributed pub sub with subscribers and publishers in different cluster system on different ports, in Java.

here is the code for app1 and its config file.