TabHost stürzt ab

package com.example.tab;

import android.app.TabActivity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.TabHost;
import android.widget.TabHost.TabSpec;

public class Tab extends TabActivity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        /** TabHost will have Tabs */
        TabHost tabHost = (TabHost)findViewById(android.R.id.tabhost);

        /** TabSpec used to create a new tab.
         * By using TabSpec only we can able to setContent to the tab.
         * By using TabSpec setIndicator() we can set name to tab. */

        /** tid1 is firstTabSpec Id. Its used to access outside. */
        TabSpec firstTabSpec = tabHost.newTabSpec("tid1");
        TabSpec secondTabSpec = tabHost.newTabSpec("tid1");

        /** TabSpec setIndicator() is used to set name for the tab. */
        /** TabSpec setContent() is used to set content for a particular tab. */
        firstTabSpec.setIndicator("First Tab Name").setContent(new Intent(this,FirstTab.class));
        secondTabSpec.setIndicator("Second Tab Name").setContent(new Intent(this,SecondTab.class));

        /** Add tabSpec to the TabHost to display. */
        tabHost.addTab(firstTabSpec);
        tabHost.addTab(secondTabSpec);

    }
}

<?xml version="1.0" encoding="utf-8"?>
<TabHost android:layout_width="fill_parent"
    android:layout_height="fill_parent" xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@android:id/tabhost">
    <LinearLayout android:id="@+id/LinearLayout01"
        android:orientation="vertical" android:layout_height="fill_parent"
        android:layout_width="fill_parent">
        <TabWidget android:id="@android:id/tabs"
            android:layout_height="wrap_content" android:layout_width="fill_parent"></TabWidget>
        <FrameLayout android:id="@android:id/tabcontent"
            android:layout_height="fill_parent" android:layout_width="fill_parent"></FrameLayout>
    </LinearLayout>
</TabHost>

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.example.tab"
      android:versionCode="1"
      android:versionName="1.0">
    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".tab"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name=".FirstTab" android:label="First Tab"></activity>
    <activity android:name=".SecondTab" android:label="First Tab"></activity>
    </application>
</manifest>

package com.example.tab;

import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;

public class FirstTab extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        /* First Tab Content */
        TextView textView = new TextView(this);
        textView.setText("First Tab");
        setContentView(textView);

    }
}

package com.example.tab;

import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;

public class SecondTab extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        /* Second Tab Content */
        TextView textView = new TextView(this);
        textView.setText("Second Tab");
        setContentView(textView);

    }
}