usm encryption error

Hi  i have made this script 

package require snmptools
snmp session lo -v 3  10.31.11.216  -u marco -a MD5 -A "12345678" -l 
authPriv -n "" -x DES -X "12345678"
puts "[lo get 1.3.6.1.2.1.5.7.0]"

but when i run it with tcl 

gel20178:/home/elsag# tclsh /home/elsag/Desktop/TEst_SNMPv3.tcl
Encryption support not enabled.
get: USM encryption error

    while executing
"lo get 1.3.6.1.2.1.5.7.0"
    invoked from within
"puts "[lo get 1.3.6.1.2.1.5.7.0]""
    (file "/home/elsag/Desktop/TEst_SNMPv3.tcl" line 17)


I give snmpd -H 2>&1 | grep defPrivType and it does nothing 
What must i do?



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