I have an issue importing the hello worlds sample project (aspectj version).

I get the following error message right on public class World:
Code:
The type org.springframework.data.neo4j.examples.hellograph.World must implement the inherited abstract method org.springframework.data.neo4j.aspects.core.NodeBacked.relateTo(Lorg/springframework/data/neo4j/aspects/core/NodeBacked;Ljava/lang/Class;Ljava/lang/String;Z)
I tried importing it in a clean Spring Source Tool Suite, but got the error message (tried 2.9.2.RELEASE and 3.0.0.M3).
I have the same error in my own project and would like to get a hint on how to fix it.

My system:
Ubuntu LTS
Maven 3
Java 6
(all apt-get'ed from ubnutu repos)