/lib/libz.so.1: no version information available

You are following the steps described in the book ‘Hello, Android’, but when you try to change the interface in section 3.3 ‘Creating the Opening Screen’, and try to run the application in either the emulator or the phone you get the following error message in the eclipse console:
/lib/libz.so.1: no version information available...

You will need to make sure that you add the needed strings, i.e (main_title, continue_label, new_game_label, about_label and exit_label) in the Sudoku/values/strings.xml file, which is described in page 51, but is not clear that you have to do that before running the app. So your strings.xml file should look like:

<?xml version="1.0" encoding="utf-8"?>
<string name="app_name">Sudoku</string>
<string name="main_title">Android Sudoku</string>
<string name="continue_label">Continue</string>
<string name="new_game_label">New Game</string>
<string name="about_label">About</string>
<string name="exit_label">Exit</string>