People Details - Class Cast Exception

Hello

When I click on the name of any portal user it should display PeopleDetails component, but it displays the next error message:

"An exception occurred during the program execution. Below you will find technical information pertaining to this exception that you might want to forward to your system administrator.

Exception Class: class java.lang.ClassCastException"

It seems that portal can't launch the proper Java class. It may be related with some customization that I did in Collaboration module (particularly, I'm suspicious on the customization that I did in security zones, even though I left everything with its initial configuration).

Have your ever experienced something like that?

I'm thinking about redeploying com.sap.netweaver.kmc.people.par, which contains the definition of PeopleDetails component. Do you think it is a good idea? Is there any guide describing the way to redeploy a standard PAR file?

Thanks in advance, kind regards!

Jon