Thank you for the reply and a happy new year! :)
I have changed src/inet/routing/extras/Batman.ned to add a simple network and I added src/inet/routing/extras/omnetpp.ini which should load the network. (I have attached the files)
I'm using OMNeT++ IDE 5.2.1 and using the source located at
https://github.com/aarizaq/inetmanet-3.x.
Also I can run the examples, however no example is included with Batman.