Cannot add NT Global Groups in Local Admin group in XP

Archived from groups: microsoft.public.windowsnt.domain (More info?)

I get an MMC error when I try to add a global group in the Local Admin. I do
not see any entries related to this error in the Event Viewer.

Our environment consist of an NT4 Domain and Netware 6. All clients have
Novell Clients 4.9 SP1. The PDC and BDCs have the Netware Client installed.

I get the same error when I try the same procedure on a plain XP client.

Error Signature follows:
AppName: mmc.exe AppVer: 5.1.2600.2180
ModName: netapi32.dll ModVer. 5.1.2600.2180
Offset: 00035bff

Thanks in advance for your assistance
Abraham Jacinto