Warning: include(conn.php): failed to open stream: No such file or directory in D:\XAMPP\htdocs\NAH\index.php on line 3

Warning: include(): Failed opening 'conn.php' for inclusion (include_path='D:\XAMPP\php\PEAR') in D:\XAMPP\htdocs\NAH\index.php on line 3

Fatal error: Call to undefined function connectDB() in D:\XAMPP\htdocs\NAH\index.php on line 14