Here is the full error details:
Error Details
=============
An error of type E_ERROR was caused in line 180 of the file /srv/htdocs/wp-content/plugins/meta-box-aio/vendor/meta-box/meta-box-builder/src/Edit.php. Error message: Uncaught Error: Class 'MBBParser\Parsers\MetaBox' not found in /srv/htdocs/wp-content/plugins/meta-box-aio/vendor/meta-box/meta-box-builder/src/Edit.php:180
Stack trace:
#0 /wordpress/core/5.5/wp-includes/class-wp-hook.php(289): MBB\Edit->update_meta_box(Array, Array)
#1 /wordpress/core/5.5/wp-includes/plugin.php(206): WP_Hook->apply_filters(Array, Array)
#2 /wordpress/core/5.5/wp-includes/post.php(3971): apply_filters('wp_insert_post_...', Array, Array, Array)
#3 /wordpress/core/5.5/wp-includes/post.php(4354): wp_insert_post(Array, false)
#4 /wordpress/core/5.5/wp-admin/includes/post.php(419): wp_update_post(Array)
#5 /wordpress/core/5.5/wp-admin/post.php(227): edit_post()
#6 {main}
thrown
.
