How to edit a model with an inline formset

I am trying to create a model with an inline formset. I followed the guide here http://kevindias.com/writing/django-class-based-views-multiple-inline-formsets/

Creating my model as in the guide works. But I am trying to edit my model. The EditPage renders fine with the form but when I submit the form I get an error on the {{ skill_form.management_form }} line in my template. list index out of range.

#models  class Job(models.Model):      user = models.ForeignKey(settings.AUTH_USER_MODEL, related_name='jobs')      title = models.CharField('job title', max_length=255)      slug = models.SlugField(max_length=255, blank=True, default='')      city = models.CharField(max_length=255)      company = models.CharField(max_length=255)      start_date = models.DateField()      type = models.CharField("Work Shedule", max_length=255)      remote = models.BooleanField("Remote Work")      contact = models.TextField()        description = models.TextField()      requirements = models.TextField(null=True, blank=True)      responsibilities = models.TextField(null=True, blank=True)      education = models.TextField(null=True, blank=True)      experience = models.TextField(null=True, blank=True)      perks = models.TextField(null=True, blank=True)      about = models.TextField("About the Company", null=True, blank=True)        post_date = models.DateField(auto_now_add=True, editable=False)      updated_date = models.DateTimeField(auto_now=True, editable=False)        class Meta:          ordering = ["-updated_date", "title"]        def __unicode__(self):          return self.title        def save(self, *args, **kwargs):          if not self.slug:              self.slug = slugify(self.title)          super(Job, self).save(*args, **kwargs)        def get_absolute_url(self):          return reverse('job:view', args=(), kwargs={'id': self.id, 'slug': self.slug})      class Skill(models.Model):      job = models.ForeignKey(Job, related_name='skills')      skill = models.CharField(max_length=255)          def __unicode__(self):          return self.skill    #forms  class JobForm(forms.ModelForm):      type = forms.ChoiceField(choices=[('Full-Time', 'Full-Time'), ('Part-Time', 'Part-Time')])        class Meta:          model = Job          fields = ['title', 'city', 'company', 'start_date', 'description',                'requirements', 'responsibilities', 'education', 'experience',                'perks', 'contact', 'remote', 'about']      SkillFormSet = inlineformset_factory(Job, Skill)      #views  class CreateJob(generic.CreateView):      model = Job      template_name = 'job/add.html'      form_class = JobForm        def get(self, request, *args, **kwargs):          """          instantiates blank versions of the form          and its inline formsets          """          self.object = None          form_class = self.get_form_class()          form = self.get_form(form_class)          skill_form = SkillFormSet()          return self.render_to_response(self.get_context_data(              form=form,              skill_form=skill_form,          ))        def post(self, request, *args, **kwargs):          """          instantiates the form with its inline formsets          with the passed POST data and validates          """          self.object = None          form_class = self.get_form_class()          form = self.get_form(form_class)          skill_form = SkillFormSet(self.request.POST)          if form.is_valid() and skill_form.is_valid():              return self.form_valid(form, skill_form)          else:              return self.form_invalid(form, skill_form)        def form_valid(self, form, skill_form):          """          If both forms are valid then create Job with skills and redirect          """          self.object = form.save(commit=False)          self.object.user = self.request.user          self.object.save()          skill_form.instance = self.object          skill_form.save()          return HttpResponseRedirect(self.object.get_absolute_url())        def form_invalid(self, form, skill_form):          """          If either of the forms are invalid          Re-render the page with data-filled forms and errors          """          return self.render_to_response(self.get_context_data(form=form, skill_form=skill_form))        @method_decorator(login_required(login_url=reverse_lazy('login')))      def dispatch(self, *args, **kwargs):          return super(CreateJob, self).dispatch(*args, **kwargs)      class EditJob(generic.UpdateView):      model = Job      template_name = 'job/edit.html'      context_object_name = 'job'        def get(self, request, *args, **kwargs):          """          instantiates the form and inline formset          """          self.object = self.get_object()          form_class = self.get_form_class()          form = self.get_form(form_class)          skill_form = SkillFormSet(instance=self.object)          return self.render_to_response(self.get_context_data(              form=form,              skill_form=skill_form,          ))        def post(self, request, *args, **kwargs):          """          instantiates the form with its inline formsets          with the passed POST data and validates          """          self.object = self.get_object()          form_class = self.get_form_class()          form = self.get_form(form_class)          skill_form = SkillFormSet(self.request.POST)          if form.is_valid() and skill_form.is_valid():              return self.form_valid(form, skill_form)          else:              return self.form_invalid(form, skill_form)        def form_valid(self, form, skill_form):          """          If both forms are valid then create Job with skills and redirect          """          self.object = form.save(commit=False)          self.object.user = self.request.user          self.object.save()          skill_form.instance = self.object          skill_form.save()          return HttpResponseRedirect(self.object.get_absolute_url())        def form_invalid(self, form, skill_form):          """          If either of the forms are invalid          Re-render the page with data-filled forms and errors          """          return self.render_to_response(self.get_context_data(form=form, skill_form=skill_form))      #edit template form  <form method="POST">{% csrf_token %}      <table class="table table-hover">          {% include "_layouts/custom_field.html" with field=form.title %}        {% include "_layouts/custom_field.html" with field=form.city %}        {% include "_layouts/custom_field.html" with field=form.company %}        {% include "_layouts/custom_field.html" with field=form.start_date %}        {% include "_layouts/custom_field.html" with field=form.type %}        {% include "_layouts/custom_field.html" with field=form.remote %}        {% include "_layouts/custom_field.html" with field=form.contact %}        {% include "_layouts/custom_field.html" with field=form.description %}        </table>      <fieldset>          <legend>Skills</legend>          {{ skill_form.management_form }}          {{ skill_form.non_form_errors }}          {% for form in skill_form %}              {{ form.id }}              <div class="inline {{ skill_form.prefix }}">                  {{ form.skill.errors }}                  {{ form.skill.label_tag }}                  {{ form.skill }}              </div>          {% endfor %}      </fieldset>      <table class="table table-hover">          {% include "_layouts/custom_field.html" with field=form.requirements %}        {% include "_layouts/custom_field.html" with field=form.responsibilities %}        {% include "_layouts/custom_field.html" with field=form.education %}        {% include "_layouts/custom_field.html" with field=form.experience %}        {% include "_layouts/custom_field.html" with field=form.perks %}        {% include "_layouts/custom_field.html" with field=form.about %}        </table>      <input type="submit" value="Edit Job" class="btn btn-primary">  </form>

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