Yii Rights

Hi, I have a table of users that must have the role authenticated plus some user administrators.

I have installed the modyle Rights:

• copied Rights folderd under protected/modules/
  
• setted 'import', 'modules', 'components' parameters in main.php
  
• changed "class Controller extends RightsBaseController" in Controller.php

Now, if i navigate to index.php?r=rights/install I have the followin error:

Error
An error occurred while installing Rights.
Please try again or consult the documentation.

a little bit criptic...

I have to do something else to run the installer?

Thanks