snmptrap and snmptt - authcommunity not found

I am trying to configure snmptt to translate the snmp traps received and handle them as passive checks in an icinga monitoring server as described here. after doing the changes to the snmptrapd.conf I am trying to restart the service and I see

authcommunity : command not found, traphandle : command not found

My understanding is that authcommunity and traphandle are just configuration directives which will tell snmptrapd about the community string to use and the traphandle script to be called.