Android-Fatal Error

Galera estou iniciando o desenvolvimento em android e segui o passo a passo do Google sobre o uso de maps api no dese. para android.

Ao criar um projeto o nomeie, removendo o example.nomedoprojeto e após isso tive que criar o xml de layout e o activity feito isso configurei de acordo com o seguinte codigo :

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >

<com.google.android.maps.MapView
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/mapview"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:apiKey="AIzaSyBtImlF-jbo_aT0DyP3CAtouI2OmHS95Qs"
android:clickable="true" />

</LinearLayout>

package com.tracker;

import android.os.Bundle;

import com.google.android.maps.MapActivity;
import com.google.android.maps.MapView;

public class MapaActivity extends MapActivity {

public MapaActivity() {
// TODO Auto-generated constructor stub
}

@Override
protected boolean isRouteDisplayed() {
// TODO Auto-generated method stub

 return false;
	}

	public void onCreate(Bundle savedInstanceState) {
 try {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_mapa);
 MapView mapView = (MapView) findViewById(R.id.mapview);
 mapView.setBuiltInZoomControls(true);
 } catch (RuntimeException e) {
 e.printStackTrace();
 }
	}
}

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.tracker"
android:versionCode="1"
android:versionName="1.0" >

 <uses-permission android:name="android.permission.INTERNET" />

 <uses-sdk
 android:minSdkVersion="8"
 android:targetSdkVersion="18" />

 <application
 android:allowBackup="true"
 android:icon="@drawable/ic_launcher"
 android:label="@string/app_name"
 android:theme="@style/AppTheme" >
 <uses-library android:name="com.google.android.maps" >
 </uses-library>

 <activity
 android:name="com.tracker.MainActivity"
 android:label="@string/app_name" >
 <intent-filter>
 <action android:name="android.intent.action.MAIN" />

 <category android:name="android.intent.category.LAUNCHER" />
 </intent-filter>
 </activity>
 </application>

</manifest>

o emulador esta com a vers. de plataforma 4.4.2 e o projeto tb, so que não está rodando ele demora muito e nao roda. no logcat da fFATAL EXECPTION no main.