Warning: mysqli_connect(): (HY000/2002): No connection could be made because the target machine actively refused it. in C:\xampp\htdocs\lms\config.php on line 4

Fatal error: Uncaught Error: Call to undefined function mysql_error() in C:\xampp\htdocs\lms\config.php:6 Stack trace: #0 C:\xampp\htdocs\lms\includes\header.php(30): include() #1 C:\xampp\htdocs\lms\course_desc.php(2): include_once('C:\\xampp\\htdocs...') #2 {main} thrown in C:\xampp\htdocs\lms\config.php on line 6