java - List fragment not appearing owing to No view found for ID error -

i'm trying launch list fragment seems working on tablets. when run app on phones app crashes. know how resolve issue? code below.

error

caused by: java.lang.illegalargumentexception: no view found id 0x7f0c0050 (com.apptacularapps.exitsexpertlondonlite:id/master_container) fragment fragmentmainlist{b76424 #1 id=0x7f0c0050} 

mainactivity.java

public class mainactivity extends actionbaractivity {      private boolean mtwopane;      @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);          fragmentmainlist newfragment = new fragmentmainlist();         fragmenttransaction transaction = getsupportfragmentmanager().begintransaction();         transaction.replace(r.id.master_container, newfragment);         transaction.commit();          if (findviewbyid(r.id.detail_container) != null) {             mtwopane = true;         }     } } 

activity_main.xml

<fragment     xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:tools="http://schemas.android.com/tools"     android:id="@+id/list_main"     android:name="com.apptacularapps.exitsexpertlondonlite.fragmentmainlist"     android:layout_width="match_parent"     android:layout_height="match_parent"     tools:context=".fragmentmainlist"     tools:layout="@android:layout/list_content"/> 

activity_main.xml (sw600dp)

<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"     android:showdividers="middle"     tools:context=".mainactivity" >      <relativelayout         android:layout_width="0dp"         android:layout_height="match_parent"         android:layout_weight="1"         android:id="@+id/master_container"/>      <framelayout         android:layout_width="0dp"         android:layout_height="match_parent"         android:layout_weight="3"         android:id="@+id/detail_container"/>  </linearlayout> 

fragmentmainlist.java

public class fragmentmainlist extends android.support.v4.app.fragment {      listview list_main;      string[] listcontent = {             "item 1",             "item 2",             "item 3"     };      private boolean mtwopane;      public view oncreateview(layoutinflater inflater, viewgroup container, bundle savedinstancestate){         view v = inflater.inflate(r.layout.fragment_main_list, container, false);         list_main = (listview)v.findviewbyid(r.id.list_main);          arrayadapter<string> adapter = new arrayadapter<string>(getactivity(),android.r.layout.simple_list_item_1,listcontent);         list_main.setadapter(adapter);          return v;     } } 

it's because have line

transaction.replace(r.id.master_container, newfragment); 

and don't have layout inside activity_main.xml has same id master_container