can't get values in mibs

access control for democommunity is well as you can see:

[littlepi@localhost]# snmpget -v 1 -c democommunity localhost system.sysUpTime.0
DISMAN-EVENT-MIB::sysUpTimeInstance = Timeticks: (81432) 0:13:34.32

but I can't snmpget all values of mymib although i can snmptranlate it
and had generated .o and .lo files in the mibgroup directory. So i
tried snmpget ucdsnmp mib,and still can't snmpget some values of
"ucdsnmp mib"(note just some not all) as the following shows.why?what
else should i do ?
[littlepi@localhost]# snmptranslate -IR -Tp prTable
+--prTable(2)
   |
   +--prEntry(1)
      |  Index: prIndex
      |
      +-- -R-- Integer32 prIndex(1)
      |        Range: 0..65535
      +-- -R-- String    prNames(2)
      |        Textual Convention: DisplayString
      |        Size: 0..255
      +-- -R-- Integer32 prMin(3)
      +-- -R-- Integer32 prMax(4)
      +-- -R-- Integer32 prCount(5)
      +-- -R-- Integer32 prErrorFlag(100)
      +-- -R-- String    prErrMessage(101)
      |        Textual Convention: DisplayString
      |        Size: 0..255
      +-- -RW- Integer32 prErrFix(102)
      +-- -R-- String    prErrFixCmd(103)
               Textual Convention: DisplayString
               Size: 0..255
[littlepi@localhost]# snmpget -v 1 -c democommunity localhost
ucdavis.prTable.prEntry.prIndex.0
Error in packet
Reason: (noSuchName) There is no such variable name in this MIB.
Failed object: UCD-SNMP-MIB::prIndex.0

thanks in advance!in hurry!
-- 
Qiang

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