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I seem to have a tricky problem since the latest ADT update to release 17. I have made a simple application to illustrate my problem, I don't know if I'm doing anything wrong. The main Activity of my application is inheriting from FragmentActivity in the support package and somehow the application crashes at launch. To illustrate, I made a sample project. First of all, here is the code of my dummy class, DummyProjectActivity, very simple: public class DummyProjectActivity extends FragmentActivity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); } } Then, there is the manifest: <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="be.emich.labs" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="8" /> <application android:icon="@drawable/ic_launcher" android:label="@string/app_name" > <activity android:name=".DummyProjectActivity" 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> The .jar file is imported correctly in the project and I am getting this stack trace: E/AndroidRuntime(11509): FATAL EXCEPTION: main E/AndroidRuntime(11509): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{be.emich.labs/be.emich.labs.DummyProjectActivity}: java.lang.ClassNotFoundException: be.emich.labs.DummyProjectActivity E/An

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