xymalf on "The plugin generated 205 characters of unexpected output"

/*
  Plugin Name: options menu
  Plugin URI:
  Description: Companion to recipe 'Implementing the plugin menu'
  Author: adrian
  Version: 1.0
  Author URI: http://www.xymalf.com

The plugin generated 205 characters of unexpected output during activation. If you notice “headers already sent” messages, problems with syndication feeds or other issues, try deactivating or removing this plugin.
 */

<?php
class MySettingsPage
{
    /**
     * Holds the values to be used in the fields callbacks
     */
    private $options;

    /**
     * Start up
     */
    public function __construct()
    {
        add_action( 'admin_menu', array( $this, 'add_plugin_page' ) );
        add_action( 'admin_init', array( $this, 'page_init' ) );
    }

    /**
     * Add options page
     */
    public function add_plugin_page()
    {
        // This page will be under "Settings"
        add_options_page(
            'Settings Admin',
            'My Settings',
            'manage_options',
            'my-setting-admin',
            array( $this, 'create_admin_page' )
        );
    }

    /**
     * Options page callback
     */
    public function create_admin_page()
    {
        // Set class property
        $this->options = get_option( 'my_option_name' );
        ?>
        <div class="wrap">
            <?php screen_icon(); ?>
            <h2>My Settings</h2>
            <form method="post" action="options.php">
            <?php
                // This prints out all hidden setting fields
                settings_fields( 'my_option_group' );
                do_settings_sections( 'my-setting-admin' );
                submit_button();
            ?>
            </form>
        </div>
        <?php
    }

    /**
     * Register and add settings
     */
    public function page_init()
    {
        register_setting(
            'my_option_group', // Option group
            'my_option_name', // Option name
            array( $this, 'sanitize' ) // Sanitize
        );

        add_settings_section(
            'setting_section_id', // ID
            'My Custom Settings', // Title
            array( $this, 'print_section_info' ), // Callback
            'my-setting-admin' // Page
        );  

        add_settings_field(
            'id_number2', // ID
            'Amazon Affiliate', // Title
            array( $this, 'id_number_callback' ), // Callback
            'my-setting-admin', // Page
            'setting_section_id' // Section
        );      

        add_settings_field(
            'title1',
            'Amazon Access',
            array( $this, 'title_callback' ),
            'my-setting-admin',
            'setting_section_id'
        );  

	add_settings_field(
            'title2',
            'Amazon secret',
            array( $this, 'title_callback' ),
            'my-setting-admin',
            'setting_section_id'
        );

    }

    /**
     * Sanitize each setting field as needed
     *
     * @param array $input Contains all settings fields as array keys
     */
    public function sanitize( $input )
    {
        $new_input = array();
        if( isset( $input['id_number'] ) )
            $new_input['id_number'] = absint( $input['id_number'] );

        if( isset( $input['title'] ) )
            $new_input['title'] = sanitize_text_field( $input['title'] );

        return $new_input;
    }

    /**
     * Print the Section text
     */
    public function print_section_info()
    {
        print 'Enter your settings below:';
    }

    /**
     * Get the settings option array and print one of its values
     */
    public function id_number_callback()
    {
        printf(
            '<input type="text" id="id_number" name="my_option_name[id_number]" value="%s" />',
            isset( $this->options['id_number'] ) ? esc_attr( $this->options['id_number']) : ''
        );
    }

    /**
     * Get the settings option array and print one of its values
     */
    public function title_callback()
    {
        printf(
            '<input type="text" id="title" name="my_option_name[title]" value="%s" />',
            isset( $this->options['title'] ) ? esc_attr( $this->options['title']) : ''
        );
    }
}

if( is_admin() )
    $my_settings_page = new MySettingsPage();

[Moderator Note: Please post code & markup between backticks or use the code button. Your posted code may now have been permanently damaged by the forum's parser.]

I have built the front end of my plugin film reviews and this is ok.
The problem I am having is building a back end.
I want to get Amazon keys from settings menu and pass them to my amazonapi.php script. Not sure how I pass the settings. At the moment can't get to second base as plugin has loads of errors and as a newbie php programmer I need help to spot them.
Also how many other pages do i need to make to get the above menu working?