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Fatal error: Uncaught TypeError: mysqli_query(): Argument #1 ($mysql) must be of type mysqli, null given in /home/edusac2/public_html/ieripoll.edusac2.info/comprobando_act.php:35 Stack trace: #0 /home/edusac2/public_html/ieripoll.edusac2.info/comprobando_act.php(35): mysqli_query(NULL, 'SELECT \n\tupper(...') #1 {main} thrown in /home/edusac2/public_html/ieripoll.edusac2.info/comprobando_act.php on line 35