[rules-users] NoSuchMethodError

Hi, I got this error when running drool 4.0: Exception in thread "main" java.lang.NoSuchMethodError: org.antlr.runtime.DFA.unpackEncodedString(Ljava/lang/String;)[S at org.drools.lang.DRLParser.<clinit>(DRLParser.java:7205) at org.drools.compiler.DrlParser.getParser(DrlParser.java:204) at org.drools.compiler.DrlParser.parse(DrlParser.java:60) at org.drools.compiler.PackageBuilder.addPackageFromDrl (PackageBuilder.java:158) I have the following jar in my class-path: drools-compiler-4.0.0.jar drools-core-4.0.0.jar mvel14-1.2rc1.jar antlr-runtime-3.0.jar antlr-3.0ea8.jar antlr-20030911.jar antlr-2.7.6.jar xerces.jar Am I missing anything? Thank you for your help! Best Regards, Tim Nguyen