[Zope] Newbie: Some error message help please

[Blue, Neil]

OK  I have noe decided to go for MySql as Postgres is too complex to set up
for now with the system that I have. I am using the mysqlUserFolder-0.5.3. I
have created a Role 'Manager' and I two users. However when I go to view the
user I get the message which I don't understand:


Zope Error
Zope has encountered an error while publishing this resource.
Error Type: AttributeError
Error Value: class RoleManager has no attribute '__call__'


Any help appreciated.
Thanks 

Neil Blue