I ran these two quiries after receiveing the message below from mrtg.  I see this error frequently but only on this device and I am trying to determine what caused it?
this device is a HP ProLiant BL p-Class C-GbE2 Interconnect Switch B.

C:\Program Files\HP OpenView\bin>snmpwalk blswr8e6b system
system.sysDescr.0 : DISPLAY STRING- (ascii):  HP ProLiant BL p-Class C-GbE2 Interconnect Switch B
system.sysObjectID.0 : OBJECT IDENTIFIER:       .iso.org.dod.internet.private.enterprises.hp.nm.3.7.11.33.1.1.1
system.sysUpTime.0 : Timeticks: (321403000) 37 days, 4:47:10.00
system.sysContact.0 : DISPLAY STRING- (ascii):
system.sysName.0 : DISPLAY STRING- (ascii):  Interconnect Switch BLSWR8E6B
system.sysLocation.0 : DISPLAY STRING- (ascii):  Data Center
system.sysServices.0 : INTEGER: 6

snmpget blswr8e6b interfaces.ifTable.ifEntry.ifOutOctets.258
interfaces.ifTable.ifEntry.ifOutOctets.258 : Counter: 2976875109

snmpget blswr8e6b interfaces.ifTable.ifEntry.ifInOctets.258
interfaces.ifTable.ifEntry.ifInOctets.258 : Counter: 545447680

SNMPv1_Session (remote host: "blswr8e6b.beverlycorp.com" (ip address removed)
                  community: "ur1now2"
                 request ID: 1258237208
                PDU bufsize: 8000 bytes
                    timeout: 2s
                    retries: 5
                    backoff: 1)
 at /usr/bin/../lib/mrtg2/SNMP_util.pm line 490 SNMPGET Problem for ifInOctets.258 ifOutOctets.258 on ur1now2@blswr8e6a.beverlycorp.com::::::v4only
 at /usr/bin/mrtg line 2035
Tuesday, 21 August 2007 at 9:46: WARNING: skipping because at least the query for ifInOctets.258 on  blswr8e6a.beverlycorp.com did not succeed Tuesday, 21 August 2007 at 9:46: WARNING: no data for ifInOctets&ifOutOctets:ur1now2@blswr8e6a.beverlycorp.com. Skipping further queries for Host blswr8e6a.beverlycorp.com in this round.
Tuesday, 21 August 2007 at 9:46: ERROR: Target[blswr8e6a.beverlycorp.com_258][_IN_] ' $target->[0]{$mode} ' did not eval into defined data Tuesday, 21 August 2007 at 9:46: ERROR: Target[blswr8e6a.beverlycorp.com_258][_OUT_] ' $target->[0]{$mode} ' did not eval into defined data Tuesday, 21 August 2007 at 9:46: ERROR: Target[blswr8e6a.beverlycorp.com_259][_IN_] ' $target->[1]{$mode} ' did not eval into defined data Tuesday, 21 August 2007 at 9:46: ERROR: Target[blswr8e6a.beverlycorp.com_259][_OUT_] ' $target->[1]{$mode} ' did not eval into defined data Tuesday, 21 August 2007 at 9:46: ERROR: Target[blswr8e6a.beverlycorp.com_262][_IN_] ' $target->[2]{$mode} ' did not eval into defined data Tuesday, 21 August 2007 at 9:46: ERROR: Target[blswr8e6a.beverlycorp.com_262][_OUT_] ' $target->[2]{$mode} ' did not eval into defined data Tuesday, 21 August 2007 at 9:46: ERROR: Target[blswr8e6a.beverlycorp.com_263][_IN_] ' $target->[3]{$mode} ' did not eval into defined data Tuesday, 21 August 2007 at 9:46: ERROR: Target[blswr8e6a.beverlycorp.com_263][_OUT_] ' $target->[3]{$mode} ' did not eval into defined data Tuesday, 21 August 2007 at 9:46: ERROR: Target[blswr8e6a.beverlycorp.com_266][_IN_] ' $target->[4]{$mode} ' did not eval into defined data Tuesday, 21 August 2007 at 9:46: ERROR: Target[blswr8e6a.beverlycorp.com_266][_OUT_] ' $target->[4]{$mode} ' did not eval into defined data Tuesday, 21 August 2007 at 9:46: ERROR: Target[blswr8e6a.beverlycorp.com_267][_IN_] ' $target->[5]{$mode} ' did not eval into defined data Tuesday, 21 August 2007 at 9:46: ERROR: Target[blswr8e6a.beverlycorp.com_267][_OUT_] ' $target->[5]{$mode} ' did not eval into defined data Tuesday, 21 August 2007 at 9:46: ERROR: Target[blswr8e6a.beverlycorp.com_270][_IN_] ' $target->[6]{$mode} ' did not eval into defined data Tuesday, 21 August 2007 at 9:46: ERROR: Target[blswr8e6a.beverlycorp.com_270][_OUT_] ' $target->[6]{$mode} ' did not eval into defined data Tuesday, 21 August 2007 at 9:46: ERROR: Target[blswr8e6a.beverlycorp.com_271][_IN_] ' $target->[7]{$mode} ' did not eval into defined data Tuesday, 21 August 2007 at 9:46: ERROR: Target[blswr8e6a.beverlycorp.com_271][_OUT_] ' $target->[7]{$mode} ' did not eval into defined data Tuesday, 21 August 2007 at 9:46: ERROR: Target[blswr8e6a.beverlycorp.com_272][_IN_] ' $target->[8]{$mode} ' did not eval into defined data Tuesday, 21 August 2007 at 9:46: ERROR: Target[blswr8e6a.beverlycorp.com_272][_OUT_] ' $target->[8]{$mode} ' did not eval into defined data Tuesday, 21 August 2007 at 9:46: ERROR: Target[blswr8e6a.beverlycorp.com_273][_IN_] ' $target->[9]{$mode} ' did not eval into defined data Tuesday, 21 August 2007 at 9:46: ERROR: Target[blswr8e6a.beverlycorp.com_273][_OUT_] ' $target->[9]{$mode} ' did not eval into defined data Tuesday, 21 August 2007 at 9:46: ERROR: Target[blswr8e6a.beverlycorp.com_276][_IN_] ' $target->[10]{$mode} ' did not eval into defined data Tuesday, 21 August 2007 at 9:46: ERROR: Target[blswr8e6a.beverlycorp.com_276][_OUT_] ' $target->[10]{$mode} ' did not eval into defined data Tuesday, 21 August 2007 at 9:46: ERROR: Target[blswr8e6a.beverlycorp.com_278][_IN_] ' $target->[11]{$mode} ' did not eval into defined data Tuesday, 21 August 2007 at 9:46: ERROR: Target[blswr8e6a.beverlycorp.com_278][_OUT_] ' $target->[11]{$mode} ' did not eval into defined data