wntMemberDel- Error:571

I have created a batch file that removes all the members of a group. Than put back in the member that are authorized. The batch file fails when a user Primary domain group is set on that account is there a work around. Note:It fails when it remove the users. The Error code is 571

 
AddExtender("WWWNT34I.DLL")

:Start
people=wntMemberList("\\SERVER01","ADMIN-WORKSTATION",@GLOBALGROUP)
sort = ItemSort(people, @Tab)
Cond=ItemCount(sort, @Tab)

While Cond!=0
 rmember = ItemExtract(1,sort,@TAB)
 wntMemberDel("\\SERVER01","ADMIN-WORKSTATION","%rmember%",@GlobalGroup)
 Cond=ItemCount(sort, @Tab)
 Goto Start
EndWhile

Display(5, "Winbatch notice", "All none authorized User Id's have been removed from ADMIN-WORKSTATION")

List1 = "ADMIN01 ADMIN03 ADMIN04 ADMIN05 ADMIN06"
List2 = "ADMIN07 ADMIN08 ADMIN09 ADMIN10 ADMIN11"
List3 = "ADMIN12 ADMIN13 ADMIN14 ADMIN15 ADMIN16"
List4 = "ADMIN17 ADMIN18 ADMIN19 ADMIN20 ADMIN21"

Display(5, "Winbatch notice", "Adding all authorized User Id's to ADMIN-WORKSTATION")

MemberCount = ItemCount(List1, " ")
for FileIndex = 1 to MemberCount
 addmember = ItemExtract(Fileindex,List1," ")
 add=wntMemberSet("\\SERVER01","ADMIN-WORKSTATION","%addmember%",@GLOBALGROUP)
 ItemRemove(1,List1," ")
next

MemberCount = ItemCount(List2, " ")
for FileIndex = 1 to MemberCount
 addmember = ItemExtract(Fileindex,List2," ")
 ItemRemove(1,List2," ")
 add=wntMemberSet("\\SERVER01","ADMIN-WORKSTATION","%addmember%",@GLOBALGROUP)
next

MemberCount = ItemCount(List3, " ")
for FileIndex = 1 to MemberCount
 addmember = ItemExtract(Fileindex,List3," ")
 add=wntMemberSet("\\SERVER01","ADMIN-WORKSTATION","%addmember%",@GLOBALGROUP)
 ItemRemove(1,List3," ")
next

MemberCount = ItemCount(List4, " ")
for FileIndex = 1 to MemberCount
 addmember = ItemExtract(Fileindex,List4," ")
 add=wntMemberSet("\\SERVER01","ADMIN-WORKSTATION","%addmember%",@GLOBALGROUP)
 ItemRemove(1,List4," ")
next

Display(5, "Winbatch notice", "All authorized User Id's have been addedto ADMIN-WORKSTATION")
exit