ManagementForm data is missing or has been tampered with???

[Nelson Varela]

Suddenly, after 7 weeks, I get this error

ValidationError: [u'ManagementForm data is missing or has been tampered with']

It worked fine for serveral weeks. I did not change a thing. This happends when I'm trying to save a page. 

Stacktrace (most recent call last):

  File "django/core/handlers/base.py", line 115, in get_response
    response = callback(request, *callback_args, **callback_kwargs)
  File "django/contrib/admin/options.py", line 372, in wrapper
    return self.admin_site.admin_view(view)(*args, **kwargs)
  File "django/utils/decorators.py", line 91, in _wrapped_view
    response = view_func(request, *args, **kwargs)
  File "django/views/decorators/cache.py", line 89, in _wrapped_view_func
    response = view_func(request, *args, **kwargs)
  File "django/contrib/admin/sites.py", line 202, in inner
    return view(request, *args, **kwargs)
  File "feincms/module/page/modeladmins.py", line 167, in change_view
    return super(PageAdmin, self).change_view(request, object_id, **kwargs)
  File "feincms/admin/item_editor.py", line 229, in change_view
    return super(ItemEditor, self).change_view(request, object_id, **kwargs)
  File "django/utils/decorators.py", line 25, in _wrapper
    return bound_func(*args, **kwargs)
  File "django/utils/decorators.py", line 91, in _wrapped_view
    response = view_func(request, *args, **kwargs)
  File "django/utils/decorators.py", line 21, in bound_func
    return func(self, *args2, **kwargs2)
  File "django/db/transaction.py", line 223, in inner
    return func(*args, **kwargs)
  File "django/contrib/admin/options.py", line 1100, in change_view
    queryset=inline.queryset(request))
  File "django/forms/models.py", line 720, in __init__
    queryset=qs, **kwargs)
  File "django/forms/models.py", line 441, in __init__
    super(BaseModelFormSet, self).__init__(**defaults)
  File "django/forms/formsets.py", line 56, in __init__
    self._construct_forms()
  File "django/forms/formsets.py", line 123, in _construct_forms
    for i in xrange(min(self.total_form_count(), self.absolute_max)):
  File "django/forms/formsets.py", line 97, in total_form_count
    return self.management_form.cleaned_data[TOTAL_FORM_COUNT]
  File "django/forms/formsets.py", line 85, in management_form
    raise ValidationError('ManagementForm data is missing or has been tampered with')

Does anyone has a clue?

I'm using django 1.5 and FeinCMS 1.7.0

[Simon Meers]

If you're able to reproduce the error, inspect the POST data being sent. You'll probably find that one of your formsets is failing to fully render due to an exception being silently swallowed somewhere, possibly due to a recent change in data/relationships.

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[Nelson Varela]

This is strange. the POST data is (i'm using Sentry):

'<unavailable>'


Also strange, this happens only on production server. I don't get this error on my local machine (using debug is false + nginx)

[Simon Meers]

maybe inspect it from the client side then, using browser developer tools

To view this discussion on the web, visit https://groups.google.com/d/msg/django-feincms/-/UU1MriPSDFgJ.