Warning: mysqli_connect(): (HY000/2002): No connection could be made because the target machine actively refused it. in D:\xampp\htdocs\tesla\opendb.php on line 2

Fatal error: Uncaught Error: Call to undefined function mysql_error() in D:\xampp\htdocs\tesla\opendb.php:2 Stack trace: #0 D:\xampp\htdocs\tesla\newreg.php(4): include() #1 {main} thrown in D:\xampp\htdocs\tesla\opendb.php on line 2