All, I am getting the error below while passing DroolsAnt build pkg as a property to RuleAgent. I am using Java 6 update 12. =================== 2009-03-02 16:48:59,363 Stdout ERROR callout.err - RuleAgent(default) INFO (Mon Mar 02 16:48:59 CST 2009): Configuring package provider : FileScanner scanning: /home/nxuser/proxy/resource/iaoc/rules/Rules.pkg java.lang.NoClassDefFoundError: org/drools/spi/Consequence at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:621) at org.drools.rule.PackageCompilationData$PackageClassLoader.fastFindClass(PackageCompilationData.java:333) at org.drools.rule.PackageCompilationData$PackageClassLoader.loadClass(PackageCompilationData.java:353) at java.lang.ClassLoader.loadClass(ClassLoader.java:252) at org.drools.common.DroolsObjectInputStream.resolveClass(DroolsObjectInputStream.java:79) at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1575) at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1496) ================== Regards Wilson