Cannot perform this operation. (Error 3032)

Possible causes:

• You tried to delete the only user account in the group Admins. The group Admins must have at least one user account. If you want to delete this account, create a new account and add it to the group Admins, or add an existing account to the group Admins, and then delete the account.
• You tried to put a user in a group to which the user already belongs, by appending either a Group object to a User object's Groups collection that already has a Group object of the same name or a User object to a Group object's Users collection that already has a User object of the same name.