[android help] Source Not Found Error Beginning Android 4 Application Development by Wei-Meng Lee, Eclipse REPOST

THIS IS A RE-POST. I VERY MUCH NEED HELP! I am a Android beginner going through a book right now thats teaching me android called Android 4 Application Development by We-Meng Lee. I am making a project that uses a preference fragment. However. When I try to run it, It takes me to a screen back in eclipse that says "Source Not found "cmp=net.learn2develop.PreferenceFragmentExample/.PreferenceFragmentExampleActivity Here is my code for preferences.xml.

  xmlns:android="http://schemas.android.com/apk/res/android" >


    android:title="Checkbox"
    android:defaultValue="false"
    android:summary="True of False"
    android:key="checkboxPref" />



    android:name="EditText"
    android:summary="Enter A string"
    android:defaultValue="[Enter a string here]"
    android:title="Edit Text"
    android:key="editTextPref" />
    android:name="Ringtone Preference"
    android:summary="Select a Ringtone"
    android:title="Ringtones"
    android:key="ringtonePref" />
        android:title="Second Preference Screen"
    android:summary="Click Here To Go To The Second Preference Screen"
    android:key="secondPrefScreenPref" />
    android:name="EditText"
    android:summary="Enter A string"
    android:title="Edit Text (second Screen)"
    android:key="secondEditTextPref" />

Here is my code for my Fragment1.java file.

 package net.learn2develop.PreferenceFragmentExample;

import android.os.Bundle;
import android.preference.PreferenceFragment;

 public class Fragment1 extends PreferenceFragment {
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    addPreferencesFromResource(R.xml.preferences);
}

}

And here is my PreferenceExampleActivity.java file

package net.learn2develop.PreferenceFragmentExample;

import android.app.Activity;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.os.Bundle;

public class PreferenceFragmentExampleActivity extends Activity {

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

    FragmentManager fragmentManager = getFragmentManager();
    FragmentTransaction fragmentTransaction =
        fragmentManager.beginTransaction();
Fragment1 fragment1 = new Fragment1();
fragmentTransaction.replace(android.R.id.content, fragment1);
fragmentTransaction.addToBackStack(null);
fragmentTransaction.commit();
}
}

Can someone enlighten me on why this is doing this? Any help is greatly appreciated!

.

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