[rules-users] RuntimeDroolsException

Hi, I'm starting to use eclipse plug.in for JRules. I created the example JRules project in eclipse and I tried to start it as Java Application but I got this exception org.drools.RuntimeDroolsException: Unable to load dialect ' org.drools.rule.builder.dialect.java.JavaDialect:java' at org.drools.compiler.PackageBuilderConfiguration.buildDialectRegistry( PackageBuilderConfiguration.java:156) at org.drools.compiler.PackageBuilder.<init>(PackageBuilder.java:131) at org.drools.compiler.PackageBuilder.<init>(PackageBuilder.java:84) at com.sample.DroolsTest.readRule(DroolsTest.java:50) at com.sample.DroolsTest.main(DroolsTest.java:21) Can someone help me? Thanks Raffo