Fatal error e checkout issues

Hi,

I am testing my site with Learnpress.
I want that after you click “Buy this course” button on course page you are directed to register/login page, set your passwors and then purchase the course in checkout page.
This is the missing step:
https://prnt.sc/aSXXyyh4nlHs

Instead I go directly to checkout page where register option is not so much visible.
Moreover login and sign up buttons are missing.

https://prnt.sc/ar58LQe0wkW_

I tried to create a new checkout page with [learn_press_checkout] shortcode, but it caused a fatal error:
(`Un errore di E_ERROR è stato causato nella linea 33 del file /home/customer/www/studiomedicopavesi.it/public_html/wp-content/plugins/learnpress/templates/checkout/review-order.php. Messaggio di errore: Uncaught Error: Call to a member function get_items() on bool in /home/customer/www/studiomedicopavesi.it/public_html/wp-content/plugins/learnpress/templates/checkout/review-order.php:33
Stack trace:
#0 /home/customer/www/studiomedicopavesi.it/public_html/wp-content/plugins/learnpress/inc/lp-template-functions.php(850): include()
#1 /home/customer/www/studiomedicopavesi.it/public_html/wp-content/plugins/learnpress/inc/templates/class-lp-template-checkout.php(21): learn_press_get_template(‘checkout/review…’, Array)
#2 /home/customer/www/studiomedicopavesi.it/public_html/wp-includes/class-wp-hook.php(307): LP_Template_Checkout->review_order(”)
#3 /home/customer/www/studiomedicopavesi.it/public_html/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters(”, Array)
#4 /home/customer/www/studiomedicopavesi.it/public_html/wp-includes/plugin.php(476): WP_Hook->do_action(Array)
#5 /home/customer/www/studiomedicopavesi.it/public_html/wp-content/plugins/learnpress/templates/checkout/form.php(32): do_action(‘lear`).

Plase suggest me how to manage this issue, thanks.