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Fatal error: Uncaught TypeError: mysqli_query(): Argument #1 ($mysql) must be of type mysqli, null given in /home/course/u10/public_html/submissions/submission06/scripts/checkoutProcess.php:66 Stack trace: #0 /home/course/u10/public_html/submissions/submission06/scripts/checkoutProcess.php(66): mysqli_query() #1 /home/course/u10/public_html/submissions/submission06/scripts/checkoutProcess.php(28): getExistingOrder() #2 /home/course/u10/public_html/submissions/submission06/scripts/checkoutProcess.php(3): displayReceipt() #3 {main} thrown in /home/course/u10/public_html/submissions/submission06/scripts/checkoutProcess.php on line 66