functions.php

add_action( 'wp_enqueue_scripts', 'enqueue_parent_theme_style' );
function enqueue_parent_theme_style() {
    wp_enqueue_style( 'parent-style', get_template_directory_uri().'/style.css' );
    wp_enqueue_style( 'child-style', get_stylesheet_directory_uri().'/style.css' );
}

produces error

Fatal error: Call to undefined function wp-enqueue-style in /home/user/public_html/wp-content/themes/Divi-SuperiorIT/functions-php on line 5