I was just trying to add a new admin user, the first for my system, and I got the following HIPO error:
WARNING: Assets of Type "system_user_group" cannot be "TYPE_1" linked to a "system_user_group"
Reported 5th Jul 2006 8:13am
WARNING: Unable to move asset with ID #11 to parent with asset ID #11 [HIPO0020]
Reported 5th Jul 2006 8:13am
I think this happened when I was trying to add a user directly to the Administrator section. Rather than creating a user first, and adding it to the Administrator group. When I did it the correct way, made the user then added their Admin permissions, it worked.