CMB2 repeatable field for option page

add_action( 'cmb2_admin_init', 'repeatable_news_add_more' );
/**
 * Hook in and register a metabox to handle a theme options page
 */
function repeatable_news_add_more() {

    $option_key = 'repeatable-news-options.php';

    /**
     * Registers options page menu item and form.
     */
    $morenews = new_cmb2_box( array(
        'id'       => $option_key . 'newsoption',
        'title'    => esc_html__( 'Add News Sections', 'cmb2' ),
        'icon_url' => 'dashicons-palmtree', // Menu icon. Only applicable if 'parent_slug' is left empty.
        'show_on'  => array(
            // Important, don't remove.
            'options-page' => $option_key,
        ),
         'menu_title'      => esc_html__( 'Add Sections', 'cmb2' ), // Falls back to 'title' (above).
         'parent_slug'     => 'cbnews-theme-option.php', // Make options page a submenu item of the themes menu.
         'capability'      => 'manage_options', // Cap required to view options-page.
        // 'position'        => 1, // Menu position. Only applicable if 'parent_slug' is left empty.
        // 'admin_menu_hook' => 'network_admin_menu', // 'network_admin_menu' to add network-level options page.
        // 'display_cb'      => false, // Override the options-page form output (CMB2_Hookup::options_page_output()).
        'save_button'     => esc_html__( 'Save Sections', 'cmb2' ), // The text for the options-page save button. Defaults to 'Save'.
    ) );

    // $group_field_id is the field id string, so in this case: $prefix . 'demo'
    $morenews_section = $morenews->add_field( array(
        'id'          => 'news-section',
        'type'        => 'group',
        'description' => esc_html__( 'Generates reusable form entries', 'cmb2' ),
        'options'     => array(
            'group_title'   => esc_html__( 'Entry {#}', 'cmb2' ), // {#} gets replaced by row number
            'add_button'    => esc_html__( 'Add Another Entry', 'cmb2' ),
            'remove_button' => esc_html__( 'Remove Entry', 'cmb2' ),
            'sortable'      => true, // beta
            // 'closed'     => true, // true to have the groups closed by default
        ),
    ) );

    /**
     * Group fields works the same, except ids only need
     * to be unique to the group. Prefix is not needed.
     *
     * The parent field's id needs to be passed as the first argument.
     */
    $morenews->add_group_field( $morenews_section, array(
        'name'       => esc_html__( 'Entry Title', 'cmb2' ),
        'id'         => 'title',
        'type'       => 'text',
        // 'repeatable' => true, // Repeatable fields are supported w/in repeatable groups (for most types)
    ) );

    $morenews->add_group_field( $morenews_section, array(
        'name'        => esc_html__( 'Description', 'cmb2' ),
        'description' => esc_html__( 'Write a short description for this entry', 'cmb2' ),
        'id'          => 'description',
        'type'        => 'textarea_small',
        //'repeatable' => true,
    ) );

    $morenews->add_group_field( $morenews_section, array(
        'name' => esc_html__( 'Entry Image', 'cmb2' ),
        'id'   => 'image',
        'type' => 'file',
    ) );

    $morenews->add_group_field( $morenews_section, array(
        'name' => esc_html__( 'Image Caption', 'cmb2' ),
        'id'   => 'image_caption',
        'type' => 'text',
    ) );
    $morenews->add_field(array(
            'name'      => esc_html('Test Text', 'cbnews'),
            'id'        => 'testtext',
            'type'      => 'text'
        ));

}