Password self-service "Errorcode 28"

Hi Evrybody.
I have a UCS server configured as PCD with “Self Service” app to manage password.
But when a user tray to change own password by yourselfe the app don’t work and return the error message:

Notification
Changing password failed. The reason could not be determined. In case it helps, the raw error message will be displayed: Errorcode 28: Modulo sconosciuto

I installed the app “Self Service” through web page “App Center”.
In the system log I can’t see any usable track. In the management-console-server.log I found:

23.01.18 18:14:19.336 LOCALE ( WARN ) : Could not find translation file: ‘umc-core.mo’
23.01.18 18:14:19.461 MODULE ( PROCESS ) : Setting auth type to None
23.01.18 18:14:19.520 MAIN ( PROCESS ) : Updating user password in 0 running module processes (auth-type: None).
23.01.18 18:14:19.521 LOCALE ( WARN ) : Could not find translation file: ‘umc-core.mo’
23.01.18 18:14:19.625 AUTH ( WARN ) : Changing password failed ((‘Modulo sconosciuto’, 28)). Prompts: []

In the management-console-web-server.log I found:

23.01.18 18:14:19.521 MAIN ( PROCESS ) : SessionClient(0x7f393a5117d0): _authenticated: success=True status=200 message=None
23.01.18 18:14:19.522 MAIN ( PROCESS ) : auth_type=None
23.01.18 18:14:19.725 MAIN ( PROCESS ) : CPSet (192.168.10.251:55262) response status code: 400
23.01.18 18:14:19.725 MAIN ( PROCESS ) : CPSet (192.168.10.251:55262) response message: Changing password failed. The reason could not be determined. In case it helps, the raw error message will be displayed: Errorcode 28: Modulo sconosciuto
23.01.18 18:14:19.725 MAIN ( PROCESS ) : CPSet (192.168.10.251:55262) response result: {‘new_password’: ‘Changing password failed. The reason could not be determined. In case it helps, the raw error message will be displayed: Errorcode 28: Modulo sconosciuto’}

In UCS I extended the LDAP schema to add some properties for the accounts and I not found problem. At the moment I have around 800 account and it’s very important to re-enable (quickly) the self service app.

Please, can anybody help me?

Thank in advance!

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