Android : Unfortunately, MyApp has stopped -

when run application on avd, gives error:

unfortunately, myapp has stopped.

when see log cat, looks this:

log cat first section

log cat second section

here mainactivity file:

package com.ghani.myapp;  import android.app.activity; import android.os.bundle; import android.view.menu; import android.view.menuitem;  public class mainactivity extends activity {  @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_main); }  @override public boolean oncreateoptionsmenu(menu menu) {     // inflate menu; adds items action bar if present.     getmenuinflater().inflate(r.menu.main, menu);     return true; }  @override public boolean onoptionsitemselected(menuitem item) {     // handle action bar item clicks here. action bar     // automatically handle clicks on home/up button, long     // specify parent activity in androidmanifest.xml.     int id = item.getitemid();     if (id == r.id.action_settings) {         return true;     }     return super.onoptionsitemselected(item); } 

}

and activity_main file:

<relativelayout 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:paddingbottom="@dimen/activity_vertical_margin" android:paddingleft="@dimen/activity_horizontal_margin" android:paddingright="@dimen/activity_horizontal_margin" android:paddingtop="@dimen/activity_vertical_margin" tools:context="com.ghani.myapp.mainactivity" >  <textview     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:text="@string/hello_world" /> 

do not use api level of 20 , platform 4.4w, android virtual device. level 19 , platform 4.2.2 set on adv runs should.