[SQU] squid

Hello

On my linux, i have a squid 2.2 and i want monitoring it with my mrtg.
When i run mrtg, it tell me a message like that :
Unknown SNMP var cacheServerRequests
Unknown SNMP var cacheServerRequests

I don't understand.
Please help me !!!!!

Thanks

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      .---.        .----------    Jeremy CHARTIER
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