Cisco Wireless Linksys Router Access via Radius Authentication

Dear Support,

                          I am using Cisco Wireless Linksys Router for client to getting internet access.For secuirty purpose i have kept the security mode as WPA2 Enterprise so that i will ask for the authentication of clients from the radius server, which i have defined in Cisco Wireless Linksys Router.

My objective is to authenticate the wireless user through radius server.I am using the Juniper SBR i.e. Stell Belt radius server.

I am getting an error.Could you please help me in configuring the cisco wireless router so that my client can get authenticated via radius server.