I have to remove o disable function "View Mail" in admin console.

I have two serve zimbra open version Zimbra and Zimbra 6.0.12.

For me is very urgent.

I hav use follow code:

#zmprov ma user@domain.com zimbraIsDelegatedAdminAccount TRUE zimbraAdminConsoleUIComponents
#zmprov grr global usr user@domain.com +adminConsoleRights
#zmprov grr global usr user@domain.com -adminLoginAs

But i show this error:

zmprov grr global usr admin1@mail.cipi.it +adminConsoleRights
ERROR: service.INVALID_REQUEST (invalid request: grantee for admin right or for user right with the can delegate modifier must be a delegated admin account or admin group, it cannot be a global admin account or a regular user account.)

How to fix this problem ?

Thanks in advance.