Set operation failed ....

Hey all,
it's me again and again ..........
currently my agent development is got an obstacle ...
i clearly have GET operation success ...
but the SET operation always failed ...
i dont know .. is there any one know how the configuration file must be ?
this is my snmpd.conf file:

----------------------------------------------------------
###########################################################################
#
# snmpd.conf
#
#   - created by the snmpconf configuration program
#



###########################################################################
# SECTION: System Information Setup
#
#   This section defines some of the information reported in
#   the "system" mib group in the mibII tree.

# syslocation: The [typically physical] location of the system.
#   Note that setting this value here means that when trying to
#   perform an snmp SET operation to the sysLocation.0 variable will make
#   the agent return the "notWritable" error code.  IE, including
#   this token in the snmpd.conf file will disable write access to
#   the variable.
#   arguments:  location_string

syslocation  Indonesia

# syscontact: The contact information for the administrator
#   Note that setting this value here means that when trying to
#   perform an snmp SET operation to the sysContact.0 variable will make
#   the agent return the "notWritable" error code.  IE, including
#   this token in the snmpd.conf file will disable write access to
#   the variable.
#   arguments:  contact_string

syscontact  "deka aditia"



###########################################################################
# SECTION: Access Control Setup
#
#   This section defines who is allowed to talk to your running
#   snmp agent.

# rocommunity: a SNMPv1/SNMPv2c read-only access community name
#   arguments:  community [default|hostname|network/bits] [oid]

####
# First, map the community name (COMMUNITY) into a security name
# (local and mynetwork, depending on where the request is coming
# from):

#       sec.name  source          community
#awal
# com2sec local     localhost       public

####
# Second, map the security names into group names:

#                 sec.model  sec.name
group MyROGroup    v1         local
group MyRWGroup    v1        local

####
# Third, create a view for us to let the groups have rights to:

#           incl/excl subtree                          mask

#awal
view all    included  .1                               80


####
# Finally, grant the 2 groups access to the 1 view with different
# write permissions:

#                context sec.model sec.level match  read   write  notif
access MyROGroup ""      any       noauth    exact  all    none   none
access MyRWGroup ""      any       noauth    exact  all    all    none


master agentx
----------------------------------------------------------

moreover i always cannot set all the object in MIB (such as sysContact or
sysLocation)
what's wrong with my snmpd.conf file ?
Does anybody know what is the problem ???

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