Same problem here:
===========
Een fout van het type E_ERROR werd veroorzaakt op regelnummer 111 van het bestand /home/noorderinzicht/public_html/wp-content/plugins/meta-box-aio/vendor/meta-box/mb-custom-post-type/src/Edit.php. Foutmelding: Uncaught Error: Class "RWMB_Update_Option" not found in /home/noorderinzicht/public_html/wp-content/plugins/meta-box-aio/vendor/meta-box/mb-custom-post-type/src/Edit.php:111
Stack trace:
#0 /home/noorderinzicht/public_html/wp-content/plugins/meta-box-aio/vendor/meta-box/mb-custom-post-type/src/Edit.php(24): MBCPT\Edit->is_premium_user()
#1 /home/noorderinzicht/public_html/wp-includes/class-wp-hook.php(310): MBCPT\Edit->register_upgrade_meta_box()
#2 /home/noorderinzicht/public_html/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters()
#3 /home/noorderinzicht/public_html/wp-includes/plugin.php(517): WP_Hook->do_action()
#4 /home/noorderinzicht/public_html/wp-admin/includes/meta-boxes.php(1599): do_action()
#5 /home/noorderinzicht/public_html/wp-admin/edit-form-advanced.php(271): register_and_do_post_meta_boxes()
#6 /home/noorderinzicht/public_html/wp-admin/post.php(206): require('/home/noorderin...')
#7 {main}
thrown
WordPress 6.1.1
PHP 8.0.22
Meta Box AIO 1.16.7
Meta Box 5.6.14
