Must not be null?

Question

Kotlin

Can't figure out how to hide BottomNavigationView. There is an application in which the switching of tabs (Fragments) is organized using the BottomNavigationView. I need to hide the navigation bar when a button is clicked on one of the fragments to go to the next fragment. I'm trying to do this from a fragment in onViewCreated:

fabCreateDeadline_deadline.setOnClickListener {
            bottom_navigation_main.visibility = View.GONE
            replaceFragment(CreateDeadlineFragment(), false)
        }

But I'm getting the "must not be null" error.
#bottom_navigation_main - id bottomnavifationview