Hi, Macklem, I just downloaded ECJ16 and run the parity example: *(GP) Even 4-Parity* java ec.Evolve -file app/parity/parity.params -p eval.problem.even=true , and it is OK on my machine. According to your description, it seems to be a problem with your parameter file. There should NOT be a parameter called "pop.subpop.0.species.pipe.source.0.problem" unless you are doing some customized design. The problem is meant to be specified in the way such that, in the parameter file, e.g., : "*ECJ_ROOT/ec/app/parity/parity.params*", there should be a line call "eval.problem=YOUR_PROBLEM_CLASS"(#97 if nothing is changed) : *"eval.problem = ec.app.parity.Parity"* Perhaps you can try to mark off all lines start with " pop.subpop.0.species.pipe.source.0.problem", and check if your problem is correctly specified. Cheers, T.S.Yo On Oct 30, 2007 8:02 AM, Loretta Macklem <[log in to unmask]> wrote: > Hi, > > I am trying to run the parity example without making changes to it. I am > getting errors that say"No class name provided parameter: > pop.subpop.0.species.pipe.source.0.problem" and if I put that parameter > equal to the problem class, I get a similar one for the stack. Anyone know > how to fix this? I didnt change anything in the example, so I am wondering > if there is something I need to do to make it work. > > Thanks for any help, > > -- > Loretta Macklem > Graduate Teaching Assistant > Michigan State University > [log in to unmask] -- -------------------------------- Ting-Shuo Yo --------------------------------