This seems more like INFO or at worst WARN to me? INFO is ideal as this tends to get spammy with large collections.
2012-07-24 12:01:36,641 ERROR [CollectdScheduler-50 Pool-fiber25] CollectionResourceWrapper: getCounterValue: invalid interval rate for node.interfaceSnmp[Se0_1_0].ifInOctets. The last valid value for the metric was 1.296939446E9 at Tue Jul 24 12:01:35 PDT 2012. This value will be used instead.