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Fatal error: Uncaught TypeError: mysqli_num_rows(): Argument #1 ($result) must be of type mysqli_result, bool given in /home/meaeca/public_html/pafa/updateAddClass2Session.php:29 Stack trace: #0 /home/meaeca/public_html/pafa/updateAddClass2Session.php(29): mysqli_num_rows(true) #1 {main} thrown in /home/meaeca/public_html/pafa/updateAddClass2Session.php on line 29