Hy I get the following error: ... Caused by: org.drools.RuntimeDroolsException: Unable to load dialect 'org.drools.rule.builder.dialect.mvel.MVELDialectConfiguration:mvel:org.drools.rule.builder.dialect.mvel.MVELDialectConfiguration' at org.drools.compiler.PackageBuilderConfiguration.addDialect(PackageBuilderConfiguration.java:313) ... ... 42 more Caused by: java.lang.ClassCastException: org.drools.rule.builder.dialect.mvel.MVELDialectConfiguration cannot be cast to org.drools.compiler.DialectConfiguration at org.drools.compiler.PackageBuilderConfiguration.addDialect(PackageBuilderConfiguration.java:308) ... 51 more I'm using drools in a maven project, pom.xml: ... <dependency> <groupId>org.drools</groupId> <artifactId>drools-compiler</artifactId> <version>5.5.0.Final</version> </dependency> <dependency> <groupId>org.drools</groupId> <artifactId>drools-core</artifactId> <version>5.5.0.Final</version> </dependency> ... What could cause this error? Thanks for your help. Kind regards, Peter _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users