Login via Post - how to


I dont know how exactly use Login via Post - GitHub - nextcloud/loginviapost: Login to Nextcloud via HTTP POST … i just add files in “apps” folder from github and enable in administration …

After I try send POST in postman - but got only error 500 with “… apps/loginviapost/lib/Controller/LoginController.php on line 120 and exactly 13 expected”

So How to corectly use this “plugin” … i just want “remote” login to NextCloud form my own Login process … .

Thank you for any advice,