python - Django - error message does not show on the form when submited -

hi have issue django form validation, here problem :

when submit form , validation not respecting condition, validationerror() not raise message.

here code :

views.py

def addarticle(request):     if request.method == 'post':         form = articleform(request.post, request.files)          if form.is_valid():             save_it = form.save(commit=false)             save_it.user = request.user             save_it.save()             form.save_m2m()             return httpresponseredirect('/')     else:         form = articleform()  context = {'form':form} return render(request, 'template.html', context, context_instance=requestcontext(request)) 

template.html

<form class="form" action="{% url "article.views.addarticle" %}" method="post" enctype='multipart/form-data'>     {% csrf_token %}     {{ form.non_field_errors }}     <div class="form-group fieldwrapper">       {{ form.titre.errors }}       {{ form.titre.label_tag }}       {{ form.titre }}     </div>     <div class="form-group fieldwrapper">       {{ form.image.errors }}       {{ form.image }}    </div>    <input type="submit" class="btn btn-default" value="submit" autocomplete="off" autocorrect="off" /> </form> 

forms.py

class articleform(forms.modelform):     class meta:         model = article      def clean_titre(self):         titre = self.cleaned_data['titre']         if len(titre) < 5:             raise validationerror('titre error')         return titre  form = articleform() 

what doing wrong ? why error message doesn't display on website?

{{ form.titre.error }} 

the line above should be:

{{ form.titre.errors }} 

it shown way in django documentation