Arkilian - a strange warning, about something not called

I am struggling to get Arkillian to work on an esoteric project that I am working on. While I am still working on this failure which has to do with sharing and referencing wildfly modules, I also get the following warning from Arkillian.

For peace of mind and in the hope of determining if the warning is a contributing factor to the questions I have, I would like to understand its cause and how to stop it.

I get the following when deploying ...

May 09, 2017 10:44:06 AM org.jboss.arquillian.core.impl.ObserverImpl resolveArguments
WARNING: Argument 2 for ArquillianServiceDeployer.doServiceDeploy is null. It won't be invoked.

      

        
        
        
      

    

and the following: un-deploy ...

May 09, 2017 10:44:18 AM org.jboss.arquillian.core.impl.ObserverImpl resolveArguments
WARNING: Argument 2 for ArquillianServiceDeployer.undeploy is null. It won't be invoked.