PHP Version 5.5.12 run in a fatal error

[pidan1995]

( ! ) Fatal error: in C:\wamp\www\database-master\src\database\DB.php on line 116
( ! ) PDOException: in C:\wamp\www\database-master\src\database\DB.php on line 116
Call Stack

Time Memory Function Location

1 0.0000 144856 {main}( ) ..\customers.php:0
2 0.0020 273792 database\DB->__construct( ) ..\customers.php:12

I do not know how to solve！ Please answer

Probably, you have not install any DB