SNMP set command error

Hi,
I am having problem while setting a key in my MIB with RW property.
Its like, if a portion of my MIB is

            |  +--mib-2(1)
            |     |
            |     +--system(1)
            |     |  |
            |     |  +-- -R-- String    sysDescr(1)
            |     |  |        Textual Convention: DisplayString
            |     |  |        Size: 0..255
            |     |  +-- -R-- TimeTicks sysUpTime(3)
            |     |  +-- -RW- String    sysContact(4)
            |     |  |        Textual Convention: DisplayString
            |     |  |        Size: 0..255
            |     |  +-- -RW- String    sysName(5)
            |     |  |        Textual Convention: DisplayString
            |     |  |        Size: 0..255


By running command

E:\usr\bin\snmpset -v1 -c public 134.202.84.118 sysName.0 s NewSystem

i get the output

Error in packet.
Reason: (readOnly) The two parties used do not have access to use the 
specified
SNMP PDU.
Failed object: SNMPv2-MIB::sysName.0

but when i give the command of
E:\usr\bin\snmpget -v1 -c public 134.202.84.118 sysName.0

i get a blank string (this is the value i need to fill)
SNMPv2-MIB::sysName.0 = STRING:

Please explain me how to solve this problem.

I am unable to solve it.

Waiting for your reply.
Regards,
Muji

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