If you get unable to find rule/unable to interpret rule messages, this means that you have rules in your rule_values table that the server doesn't know what to do with. In this case, those rules have been removed due to changes to the aggro/archery code, so go into your rules_value table, find the rules and delete them.
e.g.
Code:
delete from rule_values where rule_name = 'Aggro:PetAggroAmount';
delete from rule_values where rule_name = 'Combat:ArcheryStationaryPenalty';