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Warning: Trying to access array offset on value of type null in /var/www/html/event.php on line 2

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Fatal error: Uncaught TypeError: mysqli_query(): Argument #1 ($mysql) must be of type mysqli, null given in /var/www/html/event.php:3 Stack trace: #0 /var/www/html/event.php(3): mysqli_query(NULL, 'SELECT * FROM n...') #1 {main} thrown in /var/www/html/event.php on line 3