Error: auto_generate_settings()

Hello,

I have this client with WooCommerce and I am trying to install and activate this plugin, but when I activate the plugin the following error appears in logs and administration gets inaccessible:

[06-Oct-2020 07:56:06 UTC] PHP Fatal error: Uncaught Error: Call to a member function auto_generate_settings() on null in /wp-content/plugins/side-cart-woocommerce/admin/class-xoo-wsc-admin-settings.php:57
Stack trace:
#0 /wp-includes/class-wp-hook.php(287): Xoo_Wsc_Admin_Settings->generate_settings(”)
#1 /wp-includes/class-wp-hook.php(311): WP_Hook->apply_filters(NULL, Array)
#2 /wp-includes/plugin.php(478): WP_Hook->do_action(Array)
#3 /wp-settings.php(546): do_action(‘init’)
#4 /wp-config.php(185): require_once(‘/var/www/ma…’)
#5 /wp-load.php(37): require_once(‘/var/www/ma…’)
#6 /wp-admin/admin.php(34): require_once(‘/var/www/ma…’)
#7 /wp-admin/index.php(10): require_once(‘/var/www/ma…’)
#8 {main}
thrown in /wp-content/plugins/side-cart-woocommerce/admin/class-xoo-wsc-admin-settings.php on line 57

The system is PHP 7.3, WordPress 5.5.1.

Could you please help me, I have tried to reinstall several times, but nothing helps.

Thank you.

Tomaz