There is a null pointer problem here. I can use this code in empty Activity, but not in fragment

Question

my friend, I face this problem and don't know how to solve it, did anyone can help me?

    2022-01-04 18:38:35.256 30907-30907/com.example.finalproject E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.finalproject, PID: 30907
    java.lang.NullPointerException: Attempt to invoke virtual method 'void androidx.recyclerview.widget.RecyclerView.setLayoutManager(androidx.recyclerview.widget.RecyclerView$LayoutManager)' on a null object reference
        at com.example.finalproject.HomeFragment.setPopularRecycler(HomeFragment.java:64)
        at com.example.finalproject.HomeFragment.onCreateView(HomeFragment.java:40)
        at androidx.fragment.app.Fragment.performCreateView(Fragment.java:2963)

The above is the problem I found in Logcat, and I'll fill in the code below to hopefully fix it.