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Hi! I want to use a multiobjective fitness function, like NSGA2, in our genetic programming setup. I have put this on my parameters file: parent.0 = koza.params parent.1 = nsga2.params in koza.params the following is defined: eval = ec.simple.SimpleEvaluator (via simple.params) breed = ec.simple.SimpleBreeder (via simple.params) pop.subpop.0.species.fitness = ec.gp.koza.KozaFitness pop.subpop.0.species.pipe = ec.breed.MultiBreedingPipeline pop.subpop.0.species.pipe.source.0 = ec.gp.koza.CrossoverPipeline ... in nsga2.params: eval = ec.multiobjective.nsga2.NSGA2Evaluator breed = ec.multiobjective.nsga2.NSGA2Breeder pop.subpop.0.species.fitness = ec.multiobjective.nsga2.NSGA2MultiObjectiveFitness pop.subpop.0.species.pipe = ec.vector.breed.VectorMutationPipeline pop.subpop.0.species.pipe.source.0 = ec.vector.breed.VectorCrossoverPipeline ... but the system gets configured using the values in koza.params, apparently ignoring those in nsga2.params. I can't figure out how to correctly set this. Commenting out the relevant koza.params causes the following exception: Exception in thread "main" java.lang.ClassCastException: ec.multiobjective.nsga2.NSGA2MultiObjectiveFitness cannot be cast to ec.gp.koza.KozaFitness Its likely that the GP system its getting its configuration from some default values. We are close to our deadline, so some quick help will be greatly appreciated! Best, --Pedro J. Ponce de León