Hello si mu,
I sincerely apologize for any inconvenience caused by the issue you encountered. After thoroughly investigating the matter, I have determined that the issue is not related to our product but rather to the server configuration.
The SP LMS requires the PHP extension php-calendar, which is currently not enabled on your server. To resolve this, I kindly request you to contact your hosting provider and ask them to enable this extension.
If you need any further assistance or encounter any challenges during this process, please feel free to reach out, and I will be happy to assist you.
Thank you for your understanding and cooperation.
Best regards