Eduma theme Learnpress order Cant add student

Website : https://www.rajyaseva.com
Theme : Eduma (Support expired)

Problem:

I updated new Learnpress 4.0
But I am not able to add Customer in an order from Back end.

Please Fix it in Next Update.

Steps To recreate

1) Go to wp-admin
2) Learnpress > Orders
3) Add New
4) Try to add new customer instead of guest. or try to add multi user

The page I need help with: [log in to see the link]