Warning: include(config/conexion.php): Failed to open stream: No such file or directory in C:\xampp\htdocs\pucusana\notas.php on line 2

Warning: include(): Failed opening 'config/conexion.php' for inclusion (include_path='C:\xampp\php\PEAR') in C:\xampp\htdocs\pucusana\notas.php on line 2

Warning: Undefined variable $db in C:\xampp\htdocs\pucusana\notas.php on line 5

Fatal error: Uncaught Error: Call to a member function prepare() on null in C:\xampp\htdocs\pucusana\notas.php:5 Stack trace: #0 {main} thrown in C:\xampp\htdocs\pucusana\notas.php on line 5