[rules-users] new user - running examples

Hello everyone, I am totally new to Drools (I have basic exposure to Java, nothing more), hope that someone helps me with the following problem: I have successfully imported Eclipse plugin and ran the DroolTest.java example in Eclipse Europa (it worked OK). Then I imported Eclipse example (4.0.7) project into Eclipse workspace. But most of .drl files show error markers with messages like: Rule 01:Unable to resolve ObjectType 'Cashflow' (example4.drl) Now when I try to run Example4.java, I get the error: The project: drools-compiler which is referenced by the classpath, does not exist. In Eclipse: menu Project | Properties | Java Build Path | Projects tab shows drools-core and drools-compiler with yellow warning icons. Button Edit is grayed out, there's nothing I can do to fix those items. I have added drools-core-4.0.7.jar and drools-compiler-4.0.7.jar in Add External JARs on Libraries tab, but this does nothing to resolve the problem. How do I fix those problems so I can run examples? Regards, Marcin