Required lifecycle owner found Activity

After implementing LifeCycleOwner in Main Activity, error goes and work properly

Updated

Use latest androidx lib and u don't need to implement LifecycleOwner. Now it is implemented by default in ComponentActivity which AppcompatActivity implements

Same problem here, so I had to update my androidx.appcompat dependency, like below:

implementation 'androidx.appcompat:appcompat:1.1.0-alpha04'

no need to implement LifecycleOwner (as its implemented by default now {as mentioned by Darthcow})