Error While Changing App Directory

Hi,

I was changing my application from its directory but I am having trouble because not being able to use the database functions. Every time I try to use my login function I get the following error


include(PDO.php) [<a href='function.include'>function.include</a>]: failed to open stream: No such file or directory

this happens when the code runs the following function


 $user = Yii::app()->db->createCommand()

To change the directory I just placed the a copy of framework and a copy of the application on the same positions in the new directory

Example

moved this

root/OldDirectory/framework

root/OldDirectory/app/index.php

to

root/NewDirectory/framework

root/NewDirectory/app/index.php

if more information is needed just ask.

Thanks