[mrtg] Debugging LoadMIBs

[Alex_M]

Hello,

is there a possibility to debug MIB loading?
I want to load some Juniper MIBs and and make SNMP queries by MIB names, not
OIDs. 
I've added MIBs to LoadMIBs option but mrtg still says "Unknown SNMP var
jnxOperatingCPU.9.1.0.0".
I've searched through an archive but was not able to find clear solution...

Here is an example:

# snmpwalk -v2c -c ro-comm
-m+/data/noc/mrtg/MIBs/Juniper/mib-jnx-chassis.txt
-M+/data/noc/mrtg/MIBs/Juniper cr1-igo jnxOperatingCPU.9.1.0.0
JUNIPER-MIB::jnxOperatingCPU.9.1.0.0 = Gauge32: 1

# mrtg j.cfg 
mrtg j.cfg 
Unknown SNMP var jnxOperatingCPU.9.1.0.0
 at /usr/local/bin/mrtg line 2202
Unknown SNMP var jnxOperatingCPU.9.1.0.0
 at /usr/local/bin/mrtg line 2202
2008-11-19 20:25:01: ERROR: Target[cr1-igo][_IN_] ' $target->[0]{$mode} '
did not eval into defined data
2008-11-19 20:25:01: ERROR: Target[cr1-igo][_OUT_] ' $target->[0]{$mode} '
did not eval into defined data

# grep LoadMIBs j.cfg 
grep LoadMIBs j.cfg 
LoadMIBs: /usr/local/share/snmp/mibs/SNMPv2-SMI.txt,
/usr/local/share/snmp/mibs/SNMPv2-TC.txt,
/data/noc/mrtg/MIBs/Juniper/mib-jnx-smi.txt,
/data/noc/mrtg/MIBs/Juniper/mib-jnx-chassis.txt

How to debug it? Thanks in advance!

-- Alexander
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