Hi, I have set up a gp problem in a very similar way to the examples in the package. The individual pieces of code compile without errors. When I try to run the code I get the following error: ============================================= Threads: breed/1 eval/1 Seed: 4357 Setting up Processing GP Types Processing GP Node Constraints Processing GP Function Sets Exception in thread "main" ec.util.ParamClassLoadException: Class not found: ec.app.automation.func.X PARAMETER: gp.fs.0.func.0 EXCEPTION: java.lang.ClassNotFoundException: ec.app.automation.func.X at ec.util.ParameterDatabase.getInstanceForParameter (ParameterDatabase.j ava:172) at ec.gp.GPFunctionSet.setup(GPFunctionSet.java:284) at ec.gp.GPFunctionSet.setupFunctionSets(GPFunctionSet.java:142) at ec.gp.GPInitializer.setup(GPInitializer.java:61) at ec.EvolutionState.setup(EvolutionState.java:324) at ec.simple.SimpleEvolutionState.run(SimpleEvolutionState.java:63) at ec.Evolve.main(Evolve.java:424) ============================================== The folder ('automation') containing the problem and the functions is stored in ec\app\. X is a terminal function located in ec\app\automation\func. I believe that the parameter class X is not being found, but am not sure why. Any help on the matter would be great. Thanks a lot, anjali