AttributeError using with GAE

def addCategory(request):
user = users.get_current_user()
if users.is_current_user_admin():
if request.method == 'POST':
form = CategoryForm(request.POST)
if form.is_valid():
cd = form.cleaned_data
Category.objects.create_category(cd['name'])
return HttpResponseRedirect('/admin/dashboard/')
else:
form = CategoryForm()
temdict = {'form': form, 'title': 'New Category'}
return render_to_response('new_category.html', temdict)
else:
return render_to_response('not_admin.html', {'admin': 'no'})
and this is my model models.py

class Category(db.Model):
catid = db.IntegerProperty(required=True)
name = db.StringProperty(required=True)

def get_absolute_url(self):
return "/tag/%s/" % str(self.catid)

class Meta:
verbose_name = 'Category'
When I'm running the code it shows:

Exception Type: AttributeError
Exception Value:
type object 'Category' has no attribute '_meta'
Exception Location: D:\shwetanka\projects\shwetanka\django\forms
\models.py in fields_for_model, line 166
Python Executable: C:\Python26\pythonw.exe

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