app activate org.onosproject.ifwd returned 'null'

[Jaanki]

Hi

I am using onos 1.2.2. I have cloned onos-app-samples and using ifwd. I understand that this repo is for onos 1.3 but I need the ifwd app for onos 1.2.2. I have changed the PacketProcess method in IntentReactiveForwarding.java at line 82 from

packetService.addProcessor(processor, PacketProcessor.director(2));

to

packetService.addProcessor(processor, PacketProcessor.ADVISOR_MAX + 2);

It got compiled and I have ported the .jar and .oar files at appropriate locations. I can see the ifwd app in repo which doing repo-list.

But while activating, the error in the log is app activate org.onosproject.ifwd returned 'null'
Could this be because of the incorrect java file or some onos issue?