problem in snmpset

Hi All,

	I had rocommunity and rwcommunity having public in conf file, but i was not 
able to set system.system.sysContact.0
i did 
[/home/sharad/.snmp/mibs]# snmpset -v2c -c public localhost 
system.sysContact.0 s me@mydesktop
Error in packet.
Reason: noAccess

while my snmptranslate says I can..
[/home/sharad/.snmp/mibs]# !snmptran
snmptranslate -Tp -IR system.sysContact
+-- -RW- String    sysContact(4)
         Textual Convention: DisplayString
         Size: 0..255

then i modify the
rwcommunity  sharadc
and run 
[sharad@~/.snmp/mibs]$ snmpset -v2c -c sharadc localhost system.sysContact.0 s 
m
e@mydesktop
Error in packet.
Reason: notWritable (That object does not support modification)
Failed object: SNMPv2-MIB::sysContact.0

then i modify in snmpd.conf reading FAQ
com2sec local     localhost       sharadc
com2sec mynetwork NETWORK/24      public
group MyRWGroup v1         local
group sharadc   v2c        local
group MyRWGroup usm        local
group MyROGroup v1         mynetwork
group public    v2c        mynetwork
group MyROGroup usm        mynetwork
view all    included  .1                               80
access public ""      any       noauth    exact  all    none   none
access sharadc ""      any       noauth    exact  all    all    none

but got the same as at the first.
probably i did some thing wrong in snmpd.conf
what should change to set the variable using snmpset?

Thanks
Sharad Chandra

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