wordpress automatic page creation

functions.php

add_action('after_setup_theme', 'uckan_create_pages'); 
function uckan_create_pages(){
    $awesome_page_id = get_option("awesome_page_id");
    if (!$awesome_page_id) {
        $post1 = array(
            'post_title' => "Sayfa Adınız!",
            'post_content' => "",
            'post_status' => "publish",
            'post_type' => 'page',
        );
        $postID = wp_insert_post($post1, $error);
        update_post_meta($postID, "_wp_page_template", "template-giris.php");
        update_option("awesome_page_id", $postID);
    }
}