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Fatal error: Uncaught Error: mysqli object is already closed in /var/www/html/Conexiones/conexion_sandbox.php:15 Stack trace: #0 /var/www/html/Conexiones/conexion_sandbox.php(15): mysqli->set_charset('utf8mb4') #1 /var/www/html/Conexiones/conexion_index.php(7): include('/var/www/html/C...') #2 /var/www/html/index.php(3): include('/var/www/html/C...') #3 {main} thrown in /var/www/html/Conexiones/conexion_sandbox.php on line 15