Some Objects not accessible via standard MIB browser

Hi
 
I am using MG-SOFT  MIB browser for accessing objects.  i am able to access objects which are in snpd.conf like sysContact,sysDescr etc. (under .mib-2.system)
 
But  objects which are defined in my-MIB are not accessable  (Under .private.enterprise.) While GET ing snr  showing following error
Response binding:
Error: No such name
Error index: 1
1: snr.0 (Integer32) null
Although all objects are accessible using command line (​snmpget -On 192.168.1.25 oid).
snmpget -On 192.168.1.25
May be a user access ???
(I have create user using snmpusm)
A snap shot of MIB ia attached.
Any suggestion is appreciable .
Thanks

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