Warning: include_once(db.php): Failed to open stream: No such file or directory in C:\Users\Administrator\OneDrive\AlexCD Backup\Dokumente\Trabajo\Web Developer\PHP\LoginPro.php on line 39

Warning: include_once(): Failed opening 'db.php' for inclusion (include_path='C:\xampp\php\PEAR') in C:\Users\Administrator\OneDrive\AlexCD Backup\Dokumente\Trabajo\Web Developer\PHP\LoginPro.php on line 39

Warning: Undefined variable $connection in C:\Users\Administrator\OneDrive\AlexCD Backup\Dokumente\Trabajo\Web Developer\PHP\LoginPro.php on line 55

Warning: Undefined global variable $_SESSION in C:\Users\Administrator\OneDrive\AlexCD Backup\Dokumente\Trabajo\Web Developer\PHP\LoginPro.php on line 55

Warning: Trying to access array offset on value of type null in C:\Users\Administrator\OneDrive\AlexCD Backup\Dokumente\Trabajo\Web Developer\PHP\LoginPro.php on line 55

Fatal error: Uncaught TypeError: mysqli_query(): Argument #1 ($mysql) must be of type mysqli, null given in C:\Users\Administrator\OneDrive\AlexCD Backup\Dokumente\Trabajo\Web Developer\PHP\LoginPro.php:55 Stack trace: #0 C:\Users\Administrator\OneDrive\AlexCD Backup\Dokumente\Trabajo\Web Developer\PHP\LoginPro.php(55): mysqli_query(NULL, 'SELECT * from u...') #1 {main} thrown in C:\Users\Administrator\OneDrive\AlexCD Backup\Dokumente\Trabajo\Web Developer\PHP\LoginPro.php on line 55