[rules-users] error compilation

hello, when I execute my code an error is affiched [java] Exception in thread "main" java.lang.NoClassDefFoundError: org/antlr/stringtemplate/StringTemplateGroup [java] at org.drools.semantics.java.RuleBuilder.<clinit>(Unknown Source) [java] at org.drools.compiler.PackageBuilder.addRule(Unknown Source) [java] at org.drools.compiler.PackageBuilder.addPackage(Unknown Source) [java] at org.drools.compiler.PackageBuilder.addPackageFromDrl(Unknown Source) [java] at org.drools.jsr94.rules.admin.LocalRuleExecutionSetProviderImpl.createRuleExecutionSet(Unknown Source) [java] at org.drools.jsr94.rules.admin.LocalRuleExecutionSetProviderImpl.createRuleExecutionSet(Unknown Source) thank you for your help Best regards Ismail --------------------------------- Découvrez une nouvelle façon d'obtenir des réponses à toutes vos questions ! Profitez des connaissances, des opinions et des expériences des internautes sur Yahoo! Questions/Réponses.