Запуск FragmentActivity из действия с намерением

Я получаю принудительное закрытие каждый раз, когда пытаюсь запустить FragmentActivity из действия с использованием намерения. Вот код из Activity:

Intent intent = new Intent(getApplicationContext(), OrgHome.class);
intent.putExtra("Username", organization_name.getText().toString());
startActivity(intent);

А вот и логарифм:

08-01 16:52:45.823: E/AndroidRuntime(600): FATAL EXCEPTION: main
08-01 16:52:45.823: E/AndroidRuntime(600): java.lang.NoClassDefFoundError: com.project3.organizations.OrgHome
08-01 16:52:45.823: E/AndroidRuntime(600):  at com.project3.organizations.MainActivity$1$1.mobDBResponse(MainActivity.java:76)
08-01 16:52:45.823: E/AndroidRuntime(600):  at com.mobdb.android.MobDBRequest.onPostExecute(MobDBRequest.java:78)
08-01 16:52:45.823: E/AndroidRuntime(600):  at com.mobdb.android.MobDBRequest.onPostExecute(MobDBRequest.java:1)
08-01 16:52:45.823: E/AndroidRuntime(600):  at android.os.AsyncTask.finish(AsyncTask.java:417)
08-01 16:52:45.823: E/AndroidRuntime(600):  at android.os.AsyncTask.access$300(AsyncTask.java:127)
08-01 16:52:45.823: E/AndroidRuntime(600):  at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:429)
08-01 16:52:45.823: E/AndroidRuntime(600):  at android.os.Handler.dispatchMessage(Handler.java:99)
08-01 16:52:45.823: E/AndroidRuntime(600):  at android.os.Looper.loop(Looper.java:123)
08-01 16:52:45.823: E/AndroidRuntime(600):  at android.app.ActivityThread.main(ActivityThread.java:3683)
08-01 16:52:45.823: E/AndroidRuntime(600):  at java.lang.reflect.Method.invokeNative(Native Method)
08-01 16:52:45.823: E/AndroidRuntime(600):  at java.lang.reflect.Method.invoke(Method.java:507)
08-01 16:52:45.823: E/AndroidRuntime(600):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
08-01 16:52:45.823: E/AndroidRuntime(600):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
08-01 16:52:45.823: E/AndroidRuntime(600):  at dalvik.system.NativeStart.main(Native Method)
08-01 16:52:48.053: I/Process(600): Sending signal. PID: 600 SIG: 9

OrgHome.class правильно определен в манифесте. Что тут происходит?

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.project3.organizations"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="15" />
    <uses-permission android:name="android.permission.INTERNET"/>

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/title_activity_main" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

</manifest>