[Samba] NT_STATUS_MEMBER_IN_ALIAS

Hello All,
when i try to add a new member to local group using:

net rpc group addmem Hauptbenutzer "DOM\lokale-Hauptbenutzer"
-UPCNAME\administrator%password -S PCNAME

i get:
Could not add DOM\lokale-Hauptbenutzer to Hauptbenutzer:
NT_STATUS_MEMBER_IN_ALIAS

what does that mean?

Any hints?

Regards,
Mario Wolff

PS: tryed to use the SID of "DOM\lokale-Hauptbenutzer", same result! SID
is S-1-5-21-xxxxxxxx-xxxxxxxx-1041, no known ALIAS-SID!
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