[log in to unmask] Hi everyone. I'm new to ECJ and I am encountering a problem that I was hoping I could get some help on. I have downloaded ECJ and am working on Tutorial 4 from https://cs.gmu.edu/~eclab/projects/ecj/docs/tutorials/tutorial4/index.html , but when I go to run the file on the command line it says that it either can't find the parameter file or it can't find ec.Evolve. I've talked to some friends and they said I needed to expand my classpath. Does anyone know what they mean by that and, if so, how I can do it? Also, I'm running this on Windows , if that is relevant. Thanks for listening to my concerns. Sincerely, Travis Atchison Tutorial 4: Build a Multivalued Genetic Programming ...<https://cs.gmu.edu/~eclab/projects/ecj/docs/tutorials/tutorial4/index.html> cs.gmu.edu Tutorial 4: Build a Multivalued Genetic Programming Symbolic Regression Problem In the fourth tutorial, we will use Koza-style GP to evolve solutions to a simple multivalued symbolic regression problem.