sitemaps – Fatal error …

Fatal error: Uncaught Error: Call to undefined function seopress_pro_get_service()

in /homepages/36/d840157983/htdocs/clickandbuilds/WordPress/schoblatt/wp-content/plugins/wp-seopress/inc/functions/sitemap/template-xml-sitemaps.php on line 293

Call stack:
    seopress_xml_sitemap_index()
    wp-content/plugins/wp-seopress/inc/functions/sitemap/template-xml-sitemaps.php:539
    include()
    wp-content/plugins/wp-seopress/src/Actions/Sitemap/Render.php:71
    SEOPress\A\S\Render::render()
    wp-includes/class-wp-hook.php:308
    WP_Hook::apply_filters()
    wp-includes/class-wp-hook.php:332
    WP_Hook::do_action()
    wp-includes/plugin.php:565
    do_action_ref_array()
    wp-includes/class-wp-query.php:1870
    WP_Query::get_posts()
    wp-includes/class-wp-query.php:3787
    WP_Query::query()
    wp-includes/class-wp.php:663
    WP::query_posts()
    wp-includes/class-wp.php:783
    WP::main()
    wp-includes/functions.php:1334
    wp()
    wp-blog-header.php:16
    require()
    index.php:17