Problems with the wp customizer

Hey There.

I am building a childtheme for the llorix-one-lite theme. I am trying to set up a simple header through the customizer in WordPress. I am new at PHP and WP developing.

When I try tro access the customizer I get the following error code: Fatal error: Uncaught Error: Call to a member function add_setting() on unknown in C:\xampp\htdocs\localwp.com\wp-content\themes\llorix-one-lite-child\functions.php:20 Stack trace: #0 C:\xampp\htdocs\localwp.com\wp-includes\class-wp-hook.php(298): wpl_customize_register(Object(WP_Customize_Manager)) #1 C:\xampp\htdocs\localwp.com\wp-includes\class-wp-hook.php(323): WP_Hook->apply_filters(NULL, Array) #2 C:\xampp\htdocs\localwp.com\wp-includes\plugin.php(453): WP_Hook->do_action(Array) #3 C:\xampp\htdocs\localwp.com\wp-includes\class-wp-customize-manager.php(734): do_action('customize_regis...', Object(WP_Customize_Manager)) #4 C:\xampp\htdocs\localwp.com\wp-includes\class-wp-hook.php(298): WP_Customize_Manager->wp_loaded('') #5 C:\xampp\htdocs\localwp.com\wp-includes\class-wp-hook.php(323): WP_Hook->apply_filters(NULL, Array) #6 C:\xampp\htdocs\localwp.com\wp-includes\plugin.php(453): WP_Hook->do_action(Array) #7 C:\xampp\htdocs\localwp.com\wp-settings.php(470): do_action('wp_loaded') #8 C:\xampp\htdocs\localwp.com\wp-con in C:\xampp\htdocs\localwp.com\wp-content\themes\llorix-one-lite-child\functions.php on line 20

"Call to member function ´add_setting()´ on unknown". What does this mean? Is the ´$wp_customize´ object unknown? Anyway, here is my functions.php

´´´

//add contact_info_header customizer function wpl_customize_register( $wp_register ) { //ALL sections, settings and controls will be added $wp_customize->add_setting( 'contact_header', array( 'default' => 'Giver Uforpligtende Tilbud', 'transport' => 'refresh' ) );

$wp_customize->add_control(
    new WP_Customize_Text_Control( $wp_customize, 'Contact Heading', array(
        'label'     => __( 'Contact Heading', 'lorrix_one_lite_child'),
        'section'   => 'llorix_one_lite_contact_section',
        'settings'  => 'contact_header',
        'type'      => 'text'
        ) ) );

$wp_customize->get_section ('llorix_one_lite_contact_section')->transport = 'refresh';

}

add_action( 'customize_register', 'wpl_customize_register'); ´´´

Thanks