Fatal error: Uncaught TypeError: mysqli_set_charset(): Argument #1 ($mysql) must be of type mysqli, string given in /var/www/api.customercare.lu/www/smsgate.php:11 Stack trace: #0 /var/www/api.customercare.lu/www/smsgate.php(11): mysqli_set_charset() #1 {main} thrown in /var/www/api.customercare.lu/www/smsgate.php on line 11