AttributeError: 'list' object has no attribute 'fitness'

[Mohammed Al-eryani]

any idea of what could be the problem

It use to run perfectly but when I put the toolbox into a function and the function returns the pop it won't work

```

def runEvolution(pop_len=100):

  creator.create("FitnessMax", base.Fitness, weights=(1.0,))

  creator.create("Individual", list, fitness=creator.FitnessMax)

  creator.create("Strategy",   numpy.ndarray, typecode="d")

  def initES(icls,scls,number_of_modules,number_of_MPPT,pop_len):

    s=icls(Rand(1,number_of_MPPT,number_of_modules))

    return s

 

  toolbox = base.Toolbox()

  toolbox.register("individual", initES,creator.Individual, creator.Strategy,number_of_modules,all_Number_of_MPPT_dc_inputs,pop_len)

  toolbox.register("population", tools.initRepeat, list, toolbox.individual)

 

  toolbox.register("evaluate",   evaluate)

  toolbox.register("mate", cxTwoPointCopy)

  toolbox.register("select",     tools.selTournament, tournsize=10) 

  toolbox.register("mutate",     tools.mutShuffleIndexes, indpb=0.5)

  pop = toolbox.population(n=100)

  hof = tools.HallOfFame(3)

  stats = tools.Statistics(key=lambda ind: ind.fitness.values)

  stats.register("avg", numpy.mean, axis=0)

  stats.register("std", numpy.std, axis=0)

  stats.register("min", numpy.min, axis=0)

  stats.register("max", numpy.max, axis=0)

  pop=algorithms.eaSimple(pop, toolbox, cxpb=0.5, mutpb=0.2, ngen=40, 

                                   halloffame=hof, stats=stats, verbose=True)

  best_solution = tools.selBest(pop, 1)[0]

  print(best_solution)

  return pop

```