The error i have here is in the mx model reflection module's class metaObjectBuilder.java. The error is in this code for(IMendixObject language : Core.retrieveXPathQuery(context, "//" + Language.entityName)) this.languageCodes.add(Language.initialize(language).getCode(context)); The error states "The method initialize(IContext, IMendixIdentifier) in the type Language is not applicable for the arguments (IMendixObject)"