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CALL FOR ABSTRACT
Fatal error: Uncaught TypeError: mysqli_query(): Argument #1 ($mysql) must be of type mysqli, PDO given in /data/pptcxc-sciencesociety/html/conf/call.php:72 Stack trace: #0 /data/pptcxc-sciencesociety/html/conf/call.php(72): mysqli_query() #1 {main} thrown in /data/pptcxc-sciencesociety/html/conf/call.php on line 72