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Warning: Undefined variable $database_conexion in /home/siev/public_html/siev13/clientes/listado_gral.php on line 14

Fatal error: Uncaught TypeError: mysqli_select_db(): Argument #1 ($mysql) must be of type mysqli, null given in /home/siev/public_html/siev13/clientes/listado_gral.php:14 Stack trace: #0 /home/siev/public_html/siev13/clientes/listado_gral.php(14): mysqli_select_db(NULL, NULL) #1 {main} thrown in /home/siev/public_html/siev13/clientes/listado_gral.php on line 14