hello i have an issue where it throws an internal error while trying to login heres the error log
[11-Mar-2023 11:53:28 Europe/Berlin] PHP Fatal error: Uncaught Error: Undefined constant "INTL_IDNA_VARIANT_UTS46" in C:\xampp\htdocs\program\lib\Roundcube\rcube_utils.php:1153
Stack trace:
#0 C:\xampp\htdocs\program\lib\Roundcube\rcube_utils.php(1117): rcube_utils::idn_convert('localhost', true)
#1 C:\xampp\htdocs\program\include\rcmail.php(761): rcube_utils::idn_to_ascii('localhost')
#2 C:\xampp\htdocs\index.php(119): rcmail->login('email', 'password', 'localhost', true)
#3 {main}
thrown in C:\xampp\htdocs\program\lib\Roundcube\rcube_utils.php on line 1153