Delete app/src/main/res/layout-w720dp/fragment_room.xml

app/src/main/res/layout-w720dp/fragment_room.xml

-<?xml version="1.0" encoding="utf-8"?>
-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:tools="http://schemas.android.com/tools"
-    android:layout_width="match_parent"
-    android:layout_height="match_parent"
-    android:orientation="horizontal"
-    tools:context="chat.rocket.android.fragment.chatroom.RoomFragment">
-
-    <include layout="@layout/fragment_room_main" />
-
-    <include layout="@layout/room_side_menu" />
-</LinearLayout>
\ No newline at end of file