Errata - 2 submitted: last submission 02 Mar 2015 Page 45, 46 | Type: Code On page 45, import android.support.v7.app.ActionBarActivity; line should be, import android.support.app.Activity; On page 46, package com.packtpub.mathgamechapter2.mathgamechapter2; import android.support.v7.app.ActionBarActivity; import android.os.Bundle; public class MainActivity extends ActionBarActivity { @Override protected void onCreate(Bundle savedInstancePhase) { super.onCreate(savedInstancePhase); setContentView(R.layout.activity_main); } } should be, package com.packtpub.mathgamechapter2.mathgamechapter2; import android.app.Activity; import android.os.Bundle; public class MainActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } } Page 102 | Type: Technical Self Test question 3 should be "what is the value of isTrueOrFalse" instead of "what will x be".