snmp proxy support........problem?

Hi All,
 
I am using net-snmp-5.3.0.1.
 
I have to support proxy-agent. My setup goes as below:
 
1) linux-host1- (ip= 192.168.31.125)
    (a)  It has /usr/local/share/snmp/snmpd.conf which contains only one
line
          rwuser myser
 
    (b) It has /var/net-snmp/snmpd.conf which contains one line
          createUser myuser MD5 "mypassword" DES mypassword
       
     above line is encrypted after enabling snmpd. 
    If I am not wrong this(192.168.31.125) acts as snmp-agent.
 
2) linux-host2- (ip= 192.168.31.199) 
    (a)  It has /usr/local/share/snmp/snmpd.conf which contains only one
line
          proxy -v 3 -l AuthNoPriv -u myuser 192.168.31.125 system
 
      This(192.168.31.199) acts as proxy-snmp-agent.
      
3) linux-host2- (ip= 192.168.31.114)
    from this system I executing following snmpget command.
    [root@NPE net-snmp-5.3.0.1]# snmpget -v 3 -u myuser -l authNoPriv -a
MD5 -A mypassword 192.168.31.199 sysUpTime.0
    snmpget: Unknown user name (Sub-id not found: iso -> sysUpTime)

    Can any one guide me where I am going wrong?
 
Thanx in advance
 
Regards,
Raghavendra. S