ERROR: aaa-server group <radius> does not exist

[guest]

When the client tries the following commands, he receives ERROR: aaa-server group <radius> does not exist.

ASA5510(config)# aaa-server IASIP12 protocol radius
ASA5510(config-aaa-server-group)# test aaa authentication radius host 10.0.0.12
ERROR: aaa-server group <radius> does not exist

Cause He should use the VPN name instead of radius to test, for example, test aaa authentication IASIP12 host 10.0.0.12.