[Solved] Error encountered while retrieving the Android version [closed]

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Hope this helps!
MainActivity,java

package com.example.versioninfo;
import android.app.Activity;
import android.os.Build;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    TextView versionInfo = (TextView) findViewById(R.id.verInfo);
    versionInfo.setText("Android "+Build.VERSION.RELEASE);

    }
}

activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/tv"
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.example.versioninfo.MainActivity" >

<TextView
    android:id="@+id/verInfo"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentRight="true"
    android:layout_centerVertical="true"
    android:layout_marginRight="150dp" />

<TextView
    android:id="@+id/textView1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_above="@+id/verInfo"
    android:layout_alignParentLeft="true"
    android:layout_marginBottom="27dp"
    android:layout_marginLeft="110dp"
    android:text="Operating System : " />

</RelativeLayout>

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solved Error encountered while retrieving the Android version [closed]