Warning: require_once(db.class.php): Failed to open stream: No such file or directory in D:\web\teleflex\tst\mailclient\mailclient.data.config.write.php on line 2

Fatal error: Uncaught Error: Failed opening required 'db.class.php' (include_path='C:\xampp\php\PEAR') in D:\web\teleflex\tst\mailclient\mailclient.data.config.write.php:2 Stack trace: #0 {main} thrown in D:\web\teleflex\tst\mailclient\mailclient.data.config.write.php on line 2