Installation - Error When Browing Index.php

I get this error when I browse to the index.php page.

Fatal error: Class 'Tygh\Bootstrap' not found in C:\xampp\htdocs\init.php on line 25

I tried doing this on a Lamp stack under Centos and got the same error so I switched to

a windows based system and still the same thing.

Is there anything specific for this error?