change user data fails

Sun JDK 1.3.1_02, win2k, tomcat 3.2.4, mysql 3.23.47,
mm.mysql 2.0.11

Change user data fails with following error:

Error occured:
Cannot save user data.

I also get this in my servlet.log:

2002-03-15 14:58:50 - path="/bugbase" :action:
Processing a POST for /updateRegistration
2002-03-15 14:58:50 - path="/bugbase" :action:
Looking for ActionForm bean under
attribute 'registrationForm'
2002-03-15 14:58:50 - path="/bugbase" :action:
Recycling existing ActionForm bean instance of
class 'openfuture.bugbase.forms.RegistrationForm'
2002-03-15 14:58:50 - path="/bugbase" :action:
Populating bean properties from this request
2002-03-15 14:58:50 - path="/bugbase" :action:
Validating input form properties
2002-03-15 14:58:50 - path="/bugbase" :action: No
errors detected, accepting input
2002-03-15 14:58:50 - path="/bugbase" :action:
Looking for Action instance for class
openfuture.bugbase.actions.UpdateRegistrationAction
2002-03-15 14:58:50 - path="/bugbase" :BugBaseServlet:
handleMessage: sessionID = 281536966, type = 1
2002-03-15 14:58:50 - path="/bugbase" :action:
registration failure:exception.failed.users.save