problem with snmptraphandle

Hello
I want to run a script when receiving specific TRAP.
I wrote in the snmptrapd.conf:
	traphandle .1.3.6.1.4.1.171.10.61.2.1.3.1.6.*   /etc/snmp/down


down is a simple script:
	echo 'Interface Link Down!!!' >> /tmp/snmptrap.test.log

when i remove and insert cabel from port on my device i see in TRAP log the 
following:
	netsnmp_assert !"registration != duplicate" failed agent_registry.c:535 
netsnmp_subtree_load()
netsnmp_assert !"registration != duplicate" failed agent_registry.c:535 
netsnmp_subtree_load()
netsnmp_assert !"registration != duplicate" failed agent_registry.c:535 
netsnmp_subtree_load()
NET-SNMP version 5.4.1
2007-11-07 11:43:44 10.9.3.251(via UDP: [10.9.3.251]:1024) TRAP, SNMP v1, 
community public
        SNMPv2-SMI::enterprises.171.10.61.2 Link Down Trap (0) Uptime: 
1:10:10.03
        IF-MIB::ifIndex.8 = INTEGER: 8  
SNMPv2-SMI::enterprises.171.10.61.2.5.3.0 = STRING: "Port 8 copper link down"
2007-11-07 11:43:48 10.9.3.251(via UDP: [10.9.3.251]:1024) TRAP, SNMP v1, 
community public
        SNMPv2-SMI::enterprises.171.10.61.2 Link Up Trap (0) Uptime: 
1:10:14.36
        IF-MIB::ifIndex.8 = INTEGER: 8  
SNMPv2-SMI::enterprises.171.10.61.2.5.4.0 = STRING: "Port 8 copper link up"

but script doesnt run.
What do i do incorrect?

Yourth faithfully,
Andrey

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