Error using vCenter SSO

I have problem trying to make vCAC work with the last version of vCenter SSO (Version 5.5.0 Build 1945276).

I've tried with this version and the previous one with the same problem. First, It seams to work but when you tried to create a new tenant you get the "System Error". Then, when I try to log in the appliance, I get a popup saying: "Failed to initialize:".

The directory "/var/log/vmware/vcac" is empty in the vcac appliance.

Any help please?

Thanks a lot.

D.