Push Notification problem

I am developing the app that sends push notifications but my mobile is not supporting notifications and the app crashes. I tried to check settings of the app to enable notifications but could not. I am using Taifun Notification Extension for that. I am attaching screenshot of app settings kindly help me to solve the issue.

Which push notification extension are you using?
POST_NOTIFICATIONS permission must be present in manifest, only then you can ask for this permission.

This one

Did you miss it?

sorry I missed it will tell after using other extension. Thank you