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Fatal error: Uncaught TypeError: mysqli_query(): Argument #1 ($mysql) must be of type mysqli, null given in /home/mbarrios/public_html/assignment8/handle_form_valuerange.php:24 Stack trace: #0 /home/mbarrios/public_html/assignment8/handle_form_valuerange.php(24): mysqli_query(NULL, 'SELECT first_na...') #1 {main} thrown in /home/mbarrios/public_html/assignment8/handle_form_valuerange.php on line 24