[rules-users] Eclipse validator error

Hi, I am using drool IDE 3.0.6 on eclipse and saw bunch of errors on Eclipse Problem/ validator. The .drl file compiled and worked fine. But eclipse validators might not like the drl syntax and throw errors. Here are some errors: - The import (class) cannot be resolved - (declaration) cannot be resolved - Unable to resolve ObjectType .... I don't want to turn off all my Eclipse validator. Any body has any idea why I get those errors? Thanks, Tim