Doctrine validation failed during installation

Clean install of freepbx-v3 (revision 1468, doctrine revision 6086). At the end the installer throws an exception; no user is created in mysql:
Warning Message
freepbx/models/FreePbx_Record.php [173]:
Doctrine validation failed.
Stack Trace
* freepbx/controllers/installer.php [1324]:
FreePbx_Record->save( )
* freepbx/controllers/installer.php [1068]:
Installer_Controller->_freshInstall( )
*
Installer_Controller->processDoInstall( )
* freepbx/controllers/installer.php [197]:
call_user_func( )
*
Installer_Controller->index( )
* system/core/Kohana.php [270]:
ReflectionMethod->invokeArgs( )
*
Kohana::instance( )
* system/core/Event.php [209]:
call_user_func( )
* system/core/Bootstrap.php [55]:
Event::run( )
* index.php [102]:
require( )
Loaded in 7.5464 seconds, using 3.06MB of memory. Generated by Kohana v2.3.1.


