Error before setup process

I just tried to create a new website using modx revolution 2.0.4 pl2
I created an empty database, extracted the files of the modx-2.0.4-pl2.zip into my root directory.
Give write access to the directories named in the Installation documentation.

But When I try to start the installation process I get this error message:
Fatal error: Class ’xPDODriver_’ not found in xpdo.class.php on line 1269

What am I doing wrong?

Sorry, but I did not point my browser to the setup http://domain.tdl/setup

It works!

This topic can be deleted!

Thank you