Clearing "errors in" on cisco 3500XL

Hi Guys,

I am not sure if this is a devmon or hobbit question so I am mailing both parties. I am currently monitoring a Cisco 3500XL which is showing alot of "erros in" under the if_err section. When I clear the counters of the switch, everything returns to zero except "errors in" which still remains at the same level it was before clearing the counters. Does anybody know how to clear these values?

Brian