Regarding checkrad

Hi all... I'm trying to use checkrad to check for double login. I have read doc/Simultaneous-Use. The problem is when I'm trying to use checkrad, this is the output :- sony# checkrad cisco 10.201.1.3 37 ultrabalad 3706 Timeout: No Response from 10.201.1.3. Timeout: No Response from 10.201.1.3 My ap is cisco 340 and I already enable snmp feature. I don't know what the problem is. Plz help me.