Installation problem | Fatal error

Hello,

I tried to do a clean install of version 2.1.4. Realized the settings as shown in here: http://omeka.org/codex/Installation

However, when I direct to the installation address of the application, I get the following error:

"Fatal error: Class 'Omeka_Application' not found in /home/.../omeka/index.php on line 14

Any help?

(Sorry my bad english).

Best regards,