Irresponsive new Application after fixing automatically generated code

i'm quite new to Java and encountered some problems creating an Android Application with Eclipse Juno. I tried researching the errors already and was able to fix some - i was hoping someone could help me with the rest :)

So i create a new Android Application (Mininum SDK: API11, Target: API14 as an example), but the generated code is full of errors:

package com.example.test34;

import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;

public class MainActivity extends ActionBarActivity {

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

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
}

Because of getting an error in the styles.xml file ,i started fixing by replacing that line in the (also in values-v11 and values-v14):

style name="AppBaseTheme" parent="android:Theme.Light"

instead of:

style name="AppBaseTheme" parent="Theme.AppCompat.Light" (adding the appcompat.jar didnt help)

Here the full code after fixing:

<resources>
    <style name="AppBaseTheme" parent="android:Theme.Light">
            </style>
        <style name="AppTheme" parent="AppBaseTheme">
            </style>
</resources>

Also i removed android:showAsAction="never" in activity_main.xml.

<RelativeLayout xmlns:android="http://ift.tt/nIICcg"
    xmlns:tools="http://ift.tt/LrGmb4"
    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.test34.MainActivity" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />

</RelativeLayout>

The R.java (which was missing before) was automatically created after following those steps. After that i went to Properties > Java Build Path, added the appcompat.jar and checked the Android 4.0 checkbox.

All problems which previously occured are gone now.

Yet the App wont work on a Virtual Device (Galaxy Nexus API 14 or 19). Rightclicking on the project and selecting Run As.. > Android Application starts the Virtual Device, but i'm unable to even enter the Menu - it's not responding at all. When i start the Device first and follow the same steps (Run As.. > Android Application), it installs the app and gives the reply: "Unfortunately, The App has stopped.". Shouldnt it at least display "Hello world!"? Or did i destroy something by deleting the line android:showAsAction="never" from the activity_main.xml?

I'd be grateful for any kind of advice. Thanks a lot in advance :)