Unknown Smp Function when zoning with Smp Util(v 0.98)

[baris.cavus]

Hi,

I am using a dell md1420 enlosure and playing with sas zoning. Most of 
the smp utils work fine but when i am trying to use zoning functions 
like smp_zone_lock , smp_conf_zone_perm_tbl (any zone related function)
I got

     Zone lock result: Unknown SMP function

So what is this about. Has anyone experienced similar problem?
I appreciate any help.

Thanks,
Baris