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Fatal error: Uncaught TypeError: mysqli_query(): Argument #1 ($mysql) must be of type mysqli, null given in /var/www/services/QMS/database.php:133 Stack trace: #0 /var/www/services/QMS/database.php(133): mysqli_query() #1 /var/www/services/QMS/get_time_slots.php(36): database->getTimeSlotList() #2 /var/www/services/QMS/get_time_slots.php(43): IP_QMS->getTimeSlot() #3 {main} thrown in /var/www/services/QMS/database.php on line 133