Hello everyone,

I have this error since a long time but can't figure it out :

*Caught TypeError while rendering: coercing to Unicode: need string or 
buffer, NoneType found*

It happens in admin when I try to add or modify on one of my models 
(display works fine)


This is the model:


    class PS(models.Model):
        id_ps = models.IntegerField(null=True)
        client = models.ForeignKey(Client, null=True, blank=True)
        nom_du_site = models.CharField(max_length=250)
        rue_livraison = models.TextField(null=True)
        complement_adresse = models.TextField(null=True)
        code_postal_livraison = models.CharField(max_length=50, null=True)
        ville_livraison = models.CharField(max_length=200, null=True)
        pays_livraison = models.CharField(max_length=200, null=True)
        distributeur = models.CharField(max_length=50, null=True)
        tarif = models.CharField(max_length=250, null=True)
        type_tarif = models.CharField(max_length=50, null=True)
        type_installation = models.CharField(max_length=50, null=True)
    
        def __unicode__(self):
            return self.nom_du_site
        
        @property
        def pce(self):        
            try:
                return PCE.objects.filter(ps=self)[0]
            except IndexError:
                return
        #    
        def get_pce(self):
            from pce.models import PCE
            return PCE.objects.filter(ps=self).exclude(frequence='6M')
        #
        def get_pce_6m(self):
            from pce.models import PCE
            return PCE.objects.filter(ps=self,frequence='6M') 



Any idea what am i doing wrong here?


*Traceback:*

        Environment:
        
        Request Method: GET
        Request URL: http://127.0.0.1:8026/admin/ps/ps/add/
        Django Version: 1.2.5
        Python Version: 2.7.2
        Installed Applications:
        ['django.contrib.auth',
         'django.contrib.contenttypes',
         'django.contrib.sessions',
         'django.contrib.sites',
         'django.contrib.messages',
         'django.contrib.admin',
         'easy_thumbnails',
         'django_extensions',
         'contentadmin',
         'south',
         'sentry',
         'sentry.client',
         'indexer',
         'file_uploader',
         'paging',
         'pagination',
         'consommation',
         'ps',
         'pce',
         'profil',
         'analytics',
         'document']
        Installed Middleware:
        ('annoying.middlewares.StaticServe',
         'django.middleware.common.CommonMiddleware',
         'django.contrib.sessions.middleware.SessionMiddleware',
         'django.middleware.csrf.CsrfViewMiddleware',
         'django.contrib.auth.middleware.AuthenticationMiddleware',
         'django.contrib.messages.middleware.MessageMiddleware',
         'pagination.middleware.PaginationMiddleware')
        
        
        Template error:
        In template 
/usr/local/lib/python2.7/dist-packages/django/contrib/admin/templates/admin/includes/fieldset.html,
 
error at line 19
           Caught TypeError while rendering: coercing to Unicode: need 
string or buffer, NoneType found
           9 :             {% for field in line %}
        
        
           10 :                 <div{% if not line.fields|length_is:'1' %} 
class="field-box{% if not field.is_readonly and field.errors %} errors{% 
endif %}"{% endif %}>
        
        
           11 :                     {% if not line.fields|length_is:'1' and 
not field.is_readonly %}{{ field.errors }}{% endif %}
        
        
           12 :                     {% if field.is_checkbox %}
        
        
           13 :                         {{ field.field }}{{ field.label_tag 
}}
        
        
           14 :                     {% else %}
        
        
           15 :                         {{ field.label_tag }}
        
        
           16 :                         {% if field.is_readonly %}
        
        
           17 :                             <p>{{ field.contents }}</p>
        
        
           18 :                         {% else %}
        
        
           19 :                           *   {{ field.field }} *
        
        
           20 :                         {% endif %}
        
        
           21 :                     {% endif %}
        
        
           22 :                     {% if field.field.field.help_text %}
        
        
           23 :                         <p class="help">{{ 
field.field.field.help_text|safe }}</p>
        
        
           24 :                     {% endif %}
        
        
           25 :                 </div>
        
        
           26 :             {% endfor %}
        
        
           27 :         </div>
        
        
           28 :     {% endfor %}
        
        
           29 : </fieldset>
        
        
        Traceback:
        File 
"/usr/local/lib/python2.7/dist-packages/django/core/handlers/base.py" in 
get_response
          100.                     response = callback(request, 
*callback_args, **callback_kwargs)
        File 
"/usr/local/lib/python2.7/dist-packages/django/contrib/admin/options.py" in 
wrapper
          288.                 return 
self.admin_site.admin_view(view)(*args, **kwargs)
        File 
"/usr/local/lib/python2.7/dist-packages/django/utils/decorators.py" in 
_wrapped_view
          76.                     response = view_func(request, *args, 
**kwargs)
        File 
"/usr/local/lib/python2.7/dist-packages/django/views/decorators/cache.py" 
in _wrapped_view_func
          78.         response = view_func(request, *args, **kwargs)
        File 
"/usr/local/lib/python2.7/dist-packages/django/contrib/admin/sites.py" in 
inner
          190.             return view(request, *args, **kwargs)
        File 
"/usr/local/lib/python2.7/dist-packages/django/utils/decorators.py" in 
_wrapper
          21.             return decorator(bound_func)(*args, **kwargs)
        File 
"/usr/local/lib/python2.7/dist-packages/django/utils/decorators.py" in 
_wrapped_view
          76.                     response = view_func(request, *args, 
**kwargs)
        File 
"/usr/local/lib/python2.7/dist-packages/django/utils/decorators.py" in 
bound_func
          17.                 return func(self, *args2, **kwargs2)
        File 
"/usr/local/lib/python2.7/dist-packages/django/db/transaction.py" in 
_commit_on_success
          299.                     res = func(*args, **kw)
        File 
"/usr/local/lib/python2.7/dist-packages/django/contrib/admin/options.py" in 
add_view
          909.         return self.render_change_form(request, context, 
form_url=form_url, add=True)
        File 
"/usr/local/lib/python2.7/dist-packages/django/contrib/admin/options.py" in 
render_change_form
          692.         ], context, context_instance=context_instance)
        File 
"/usr/local/lib/python2.7/dist-packages/django/shortcuts/__init__.py" in 
render_to_response
          20.     return HttpResponse(loader.render_to_string(*args, 
**kwargs), **httpresponse_kwargs)
        File 
"/usr/local/lib/python2.7/dist-packages/django/template/loader.py" in 
render_to_string
          186.     return t.render(context_instance)
        File 
"/usr/local/lib/python2.7/dist-packages/django/template/__init__.py" in 
render
          173.             return self._render(context)
        File 
"/usr/local/lib/python2.7/dist-packages/django/template/__init__.py" in 
_render
          167.         return self.nodelist.render(context)
        File 
"/usr/local/lib/python2.7/dist-packages/django/template/__init__.py" in 
render
          796.                 bits.append(self.render_node(node, context))
        File 
"/usr/local/lib/python2.7/dist-packages/django/template/debug.py" in 
render_node
          72.             result = node.render(context)
        File 
"/usr/local/lib/python2.7/dist-packages/django/template/loader_tags.py" in 
render
          125.         return compiled_parent._render(context)
        File 
"/usr/local/lib/python2.7/dist-packages/django/template/__init__.py" in 
_render
          167.         return self.nodelist.render(context)
        File 
"/usr/local/lib/python2.7/dist-packages/django/template/__init__.py" in 
render
          796.                 bits.append(self.render_node(node, context))
        File 
"/usr/local/lib/python2.7/dist-packages/django/template/debug.py" in 
render_node
          72.             result = node.render(context)
        File 
"/usr/local/lib/python2.7/dist-packages/django/template/loader_tags.py" in 
render
          125.         return compiled_parent._render(context)
        File 
"/usr/local/lib/python2.7/dist-packages/django/template/__init__.py" in 
_render
          167.         return self.nodelist.render(context)
        File 
"/usr/local/lib/python2.7/dist-packages/django/template/__init__.py" in 
render
          796.                 bits.append(self.render_node(node, context))
        File 
"/usr/local/lib/python2.7/dist-packages/django/template/debug.py" in 
render_node
          72.             result = node.render(context)
        File 
"/usr/local/lib/python2.7/dist-packages/django/template/loader_tags.py" in 
render
          62.             result = block.nodelist.render(context)
        File 
"/usr/local/lib/python2.7/dist-packages/django/template/__init__.py" in 
render
          796.                 bits.append(self.render_node(node, context))
        File 
"/usr/local/lib/python2.7/dist-packages/django/template/debug.py" in 
render_node
          72.             result = node.render(context)
        File 
"/usr/local/lib/python2.7/dist-packages/django/template/defaulttags.py" in 
render
          174.                 nodelist.append(node.render(context))
        File 
"/usr/local/lib/python2.7/dist-packages/django/template/loader_tags.py" in 
render
          139.             return self.template.render(context)
        File 
"/usr/local/lib/python2.7/dist-packages/django/template/__init__.py" in 
render
          173.             return self._render(context)
        File 
"/usr/local/lib/python2.7/dist-packages/django/template/__init__.py" in 
_render
          167.         return self.nodelist.render(context)
        File 
"/usr/local/lib/python2.7/dist-packages/django/template/__init__.py" in 
render
          796.                 bits.append(self.render_node(node, context))
        File 
"/usr/local/lib/python2.7/dist-packages/django/template/debug.py" in 
render_node
          72.             result = node.render(context)
        File 
"/usr/local/lib/python2.7/dist-packages/django/template/defaulttags.py" in 
render
          174.                 nodelist.append(node.render(context))
        File 
"/usr/local/lib/python2.7/dist-packages/django/template/defaulttags.py" in 
render
          174.                 nodelist.append(node.render(context))
        File 
"/usr/local/lib/python2.7/dist-packages/django/template/defaulttags.py" in 
render
          260.             return self.nodelist_false.render(context)
        File 
"/usr/local/lib/python2.7/dist-packages/django/template/__init__.py" in 
render
          796.                 bits.append(self.render_node(node, context))
        File 
"/usr/local/lib/python2.7/dist-packages/django/template/debug.py" in 
render_node
          72.             result = node.render(context)
        File 
"/usr/local/lib/python2.7/dist-packages/django/template/defaulttags.py" in 
render
          260.             return self.nodelist_false.render(context)
        File 
"/usr/local/lib/python2.7/dist-packages/django/template/__init__.py" in 
render
          796.                 bits.append(self.render_node(node, context))
        File 
"/usr/local/lib/python2.7/dist-packages/django/template/debug.py" in 
render_node
          72.             result = node.render(context)
        File 
"/usr/local/lib/python2.7/dist-packages/django/template/debug.py" in render
          91.             output = force_unicode(output)
        File 
"/usr/local/lib/python2.7/dist-packages/django/utils/encoding.py" in 
force_unicode
          66.                 s = unicode(s)
        File "/usr/local/lib/python2.7/dist-packages/django/forms/forms.py" 
in __unicode__
          408.         return self.as_widget()
        File "/usr/local/lib/python2.7/dist-packages/django/forms/forms.py" 
in as_widget
          450.         return widget.render(name, data, attrs=attrs)
        File 
"/usr/local/lib/python2.7/dist-packages/django/contrib/admin/widgets.py" in 
render
          247.         output = [self.widget.render(name, value, *args, 
**kwargs)]
        File 
"/usr/local/lib/python2.7/dist-packages/django/forms/widgets.py" in render
          447.         options = self.render_options(choices, [value])
        File 
"/usr/local/lib/python2.7/dist-packages/django/forms/widgets.py" in 
render_options
          464.         for option_value, option_label in 
chain(self.choices, choices):
        File 
"/usr/local/lib/python2.7/dist-packages/django/forms/models.py" in __iter__
          898.                 yield self.choice(obj)
        File 
"/usr/local/lib/python2.7/dist-packages/django/forms/models.py" in choice
          904.         return (self.field.prepare_value(obj), 
self.field.label_from_instance(obj))
        File 
"/usr/local/lib/python2.7/dist-packages/django/forms/models.py" in 
label_from_instance
          955.         return smart_unicode(obj)
        File 
"/usr/local/lib/python2.7/dist-packages/django/utils/encoding.py" in 
smart_unicode
          39.     return force_unicode(s, encoding, strings_only, errors)
        File 
"/usr/local/lib/python2.7/dist-packages/django/utils/encoding.py" in 
force_unicode
          66.                 s = unicode(s)
        
        Exception Type: TemplateSyntaxError at /admin/ps/ps/add/
        Exception Value: Caught TypeError while rendering: coercing to 
Unicode: need string or buffer, NoneType found


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