Hi! Great project, thanks. However I've experianced some bugs.

model = pygad.GA(someparameters - may be even sample model from documentation)
model.run()
model.plot_fitness(plot_type="scatter")
ok
model.run()
model.plot_fitess()
ok
model.plot_fitness(plot_type="scatter")

ValueError Traceback (most recent call last)
in
----> 1 ga_instance.plot_fitness(plot_type="scatter")

~/.conda/envs/test/lib/python3.9/site-packages/pygad/pygad.py in plot_fitness(self, title, xlabel, ylabel, linewidth, font_size, plot_type, color, save_dir)
3150 matplotlib.pyplot.plot(self.best_solutions_fitness, linewidth=linewidth, color=color)
3151 elif plot_type == "scatter":
-> 3152 matplotlib.pyplot.scatter(range(self.generations_completed + 1), self.best_solutions_fitness, linewidth=linewidth, color=color)
3153 elif plot_type == "bar":
3154 matplotlib.pyplot.bar(range(self.generations_completed + 1), self.best_solutions_fitness, linewidth=linewidth, color=color)

~/.conda/envs/test/lib/python3.9/site-packages/matplotlib/pyplot.py in scatter(x, y, s, c, marker, cmap, norm, vmin, vmax, alpha, linewidths, edgecolors, plotnonfinite, data, **kwargs)
3066 vmin=None, vmax=None, alpha=None, linewidths=None, *,
3067 edgecolors=None, plotnonfinite=False, data=None, **kwargs):
-> 3068 __ret = gca().scatter(
3069 x, y, s=s, c=c, marker=marker, cmap=cmap, norm=norm,
3070 vmin=vmin, vmax=vmax, alpha=alpha, linewidths=linewidths,

~/.conda/envs/test/lib/python3.9/site-packages/matplotlib/init.py in inner(ax, data, *args, **kwargs)
1359 def inner(ax, *args, data=None, **kwargs):
1360 if data is None:
-> 1361 return func(ax, *map(sanitize_sequence, args), **kwargs)
1362
1363 bound = new_sig.bind(ax, *args, **kwargs)

~/.conda/envs/test/lib/python3.9/site-packages/matplotlib/axes/_axes.py in scatter(self, x, y, s, c, marker, cmap, norm, vmin, vmax, alpha, linewidths, edgecolors, plotnonfinite, **kwargs)
4496 y = np.ma.ravel(y)
4497 if x.size != y.size:
-> 4498 raise ValueError("x and y must be the same size")
4499
4500 if s is None:

ValueError: x and y must be the same size