React Native with custom FirebaseMessagingService


I have setup Push Notification for my React Native project via Clevertap (did not use react-native-clevertap). I am also receiving notifications via Clevertap dashboard.
Now I am trying to integrate Notification by extending FirebaseMessagingService, following the documentation.My application is crashing after I send a notification from Dashboard.
Usage: I require Notification data on my JS side which I would achieve via event listeners but currently my basic notifications are not working via custom FirebaseMessagingService class.