RecyclerView exception using PreferenceFragmentCompat without using RecyclerView

I am using PreferenceFragmentCompat and I am getting this runtime exception:

Attempt to invoke virtual method 'void android.support.v7.widget.RecyclerView.setAdapter(android.support.v7.widget.RecyclerView$Adapter)' on a null object reference

      

        
        
        
      

    

The confusing part is that my preference definition does not contain any RecyclerView. Here is the XML:

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.preference.PreferenceScreen
xmlns:android="http://schemas.android.com/apk/res/android" >

<android.support.v7.preference.PreferenceCategory
    android:layout="@layout/preference_first_category"
    android:title="@string/pref_category_general">

    <android.support.v7.preference.SwitchPreferenceCompat
        android:title="@string/pref_demo_mode"
        android:key="@string/pref_demo_mode_key"
        android:defaultValue="true"
        android:persistent="true" />

</android.support.v7.preference.PreferenceCategory>

<android.support.v7.preference.PreferenceCategory
    android:layout="@layout/preference_category"
    android:key="serverCategory"
    android:persistent="false"
    android:title="@string/pref_category_server">

    <android.support.v7.preference.EditTextPreference
        android:title="@string/pref_server_control_ip"
        android:summary="@string/pref_enter_ip_address"
        android:defaultValue="@string/pref_enter_ip_address"
        android:key="@string/pref_ctrl_ip_key"
        android:selectAllOnFocus="true"
        android:singleLine="true"
        android:persistent="true" />

    <android.support.v7.preference.EditTextPreference
        android:title="@string/pref_server_admin_ip"
        android:summary="@string/pref_enter_ip_address"
        android:defaultValue="@string/pref_enter_ip_address"
        android:key="@string/pref_admin_ip_key"
        android:selectAllOnFocus="true"
        android:singleLine="true"
        android:persistent="true" />

    <android.support.v7.preference.EditTextPreference
        android:title="@string/pref_server_network_mask"
        android:defaultValue="@string/pref_enter_network_mask"
        android:summary="@string/pref_enter_network_mask"
        android:key="@string/pref_network_mask_key"
        android:selectAllOnFocus="true"
        android:singleLine="true"
        android:persistent="true" />

</android.support.v7.preference.PreferenceCategory>         
</android.support.v7.preference.PreferenceScreen>

      

        
        
        
      

    

I've looked at the API reference and can clearly see that the PreferenceFragmentCompat supports RecyclerView, but I've seen some working code examples that don't have a RecyclerView in my preference, so it looks like the RecyclerView is optional.

Do I need to override any RecyclerView methods? Other working examples without RecyclerView didn't need this, so I don't understand how to resolve this.

Thanks, -Andres