Upgrade to 5.6.1 broken wordpress

I updated the plugin to version 5.6.1 but I can’t create a new article anymore.
The automatic wordpress email warns me:
“WordPress has encountered an error with one of your plugins, Event Post.”

In fact by downgrading to version 5.5 everything starts working again.
What can I do to get the latest version working?

WordPress version 5.8.4
Current Theme: Foodica (version 1.2.2)
Current Plugin: Event Post (version 5.6.1)
PHP version 7.4.28

Error details
====================
An E_ERROR error was caused in line 732 of the file /home/tpvypdfd/public_html/wp-content/plugins/event-post/eventpost.php. Error message: Uncaught Error: Call to undefined function wp_get_global_settings() in /home/tpvypdfd/public_html/wp-content/plugins/event-post/eventpost.php:732
Stack trace:
#0 /home/tpvypdfd/public_html/wp-content/plugins/event-post/eventpost.php(630): EventPost->get_theme_palette(‘hex’)
#1 /home/tpvypdfd/public_html/wp-includes/class-wp-hook.php(303): EventPost->admin_scripts(Array)
#2 /home/tpvypdfd/public_html/wp-includes/class-wp-hook.php(327): WP_Hook->apply_filters(”, Array)
#3 /home/tpvypdfd/public_html/wp-includes/plugin.php(470): WP_Hook->do_action(Array)
#4 /home/tpvypdfd/public_html/wp-admin/admin-header.php(130): do_action(‘admin_print_scr…’)
#5 /home/tpvypdfd/public_html/wp-admin/edit-form-blocks.php(289): require_once(‘/home/tpvypdfd/…’)
#6 /home/tpvypdfd/public_html/wp-admin/post-new.php(72): require(‘/home/tpvypdfd/…’)
#7 {main}
thrown