EAP-PSK : 16 bytes Pre shared key not configured

Hi, I implemented the module eap2 to make freeradius with the eap_psk .  After started the freeradius server (radius_output file attached to this mail), i launched my client openpana, the authentication failed and i have this error message "EAP-PSK : 16 bytes Preshared key not configured" (refer to openpana_client_output file attached to this mail) I would like to know how to configure the pre-shared key in my server? Thanks.