.net estate general interfaces

hallo i am now enactment around palace projects activerecord remoting facility.

my tide problem i need proceed exercise save servant ibaserepository castle category i dont know how.

here tide code, vs tells me line "implements iaddress"
that i have exercise servant save(obj iaddress) [shared].ibaserepository(of [shared].iaddress)

and line open overrides servant save(byval obj address) implements ibaserepository(of iaddress).save

that i cant exercise save means there servant save [shared].ibaserepository(of [shared].iaddress)

i only dont :(
please illuminate me.

tia

public interface ibaserepository(of t class)  
     servant save(byval obj t)  
end interface

public interface iaddress  
    inherits ibaserepository(of iaddress)  
    ability guid() guid  
    ability companyname() twine  
    ability surename() twine  
    ability christianname() twine  
end interface`

public category baserepository(of t class)  
inherits marshalbyrefobject   
implements ibaserepository(of t)

    stable match activerecordmediator(of t)  

    open overridable servant save(byval obj t) implements ibaserepository(of t).save  
        activerecordmediator(of t).save(obj)  
    finish servant  
end class


<activerecord("address")> _    
public category castle  
    inherits baserepository(of address)  
    implements iaddress

    open overrides servant save(byval obj address) implements ibaserepository(of iaddress).save
        mybase.save(obj)
    finish sub
end class