Android Studio java.lang.RuntimeException: Unable to start activity ComponentInfo

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http://stackoverflow.com – I'm moving now my project from Android Studio 0.2.x to 0.3.0 and I have quite strange problem. LoginActivity.java public class LoginActivity extends Activity implements OnClickListener, TextWatcher { private EditText _loginEditText; private EditText _passwordEditText; private Button _loginButton; private String _login; private String _password; private String _result; private ProgressDialog _progressDialog; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity (HowTos)