When i edit a page an error message appears, if i deactivate the plugin its ok

Hi there,

The following error message appears:



Ein Fehler vom Typ E_ERROR wurde in der Zeile 4169 der Datei /volume1/web/wordpress/wp-content/plugins/options-for-twenty-twenty-one/options-for-twenty-twenty-one.php verursacht. Fehlermeldung: Uncaught Error: Class 'WpOrg\Requests\Utility\CaseInsensitiveDictionary' not found in /volume1/web/wordpress/wp-content/plugins/options-for-twenty-twenty-one/options-for-twenty-twenty-one.php:4169

Stack trace:

#0 /volume1/web/wordpress/wp-includes/class-wp-hook.php(292): options_for_twenty_twenty_one_class->oftto_pre_http_request(false, Array, 'https://options...')

#1 /volume1/web/wordpress/wp-includes/plugin.php(212): WP_Hook->apply_filters(false, Array)

#2 /volume1/web/wordpress/wp-includes/class-http.php(257): apply_filters('pre_http_reques...', false, Array, 'https://options...')

#3 /volume1/web/wordpress/wp-includes/class-http.php(626): WP_Http->request('https://options...', Array)

#4 /volume1/web/wordpress/wp-includes/http.php(162): WP_Http->get('https://options...', Array)

#5 /volume1/web/wordpress/wp-admin/edit-form-blocks.php(203): wp_remote_get('https://options...')

#6 /volume1/web/wordpress/wp-admin/post.php(187): require('/volume1/web/wo...')

#7 {main}


It is a page that is not publicly accessible, so I cannot post the link publicly. The site is hosted on a Synology NAS.

can anyone help?
Thank you in advance



This site will teach you how to build a WordPress website for beginners. We will cover everything from installing WordPress to adding pages, posts, and images to your site. You will learn how to customize your site with themes and plugins, as well as how to market your site online.

Buy WordPress Transfer