Exception name: PluginRegistrantException

Error message:

PluginRegistrantCallback is not set. Did you forget to call AlarmService.setPluginRegistrant? See the README for instructions.

Solution: Simply open the android project. Perform a Gradle sync. Next, do a “build -> clean project” and “build -> rebuild project”.

Ref. link: https://stackoverflow.com/a/54972225/2704360