Content type returns this :ContentType matching query does not exist.

My views.py is this
if k == 3:

perm = PermiLayer()
perm.user = user

perm.permi = k
if int(rad4) == 0:
perm.table =
ContentType.objects.get(app_label="OsmMap",model="Osm_Layers")
else :
perm.table =
ContentType.objects.get(app_label="openmaps",model="Open_Layers")

perm.save()
return render_to_response('permgiven.html', {'val':k})

My traceback is this

Traceback:
File "/usr/local/lib/python2.6/dist-packages/django/core/handlers/
base.py" in get_response
111. response = callback(request,
*callback_args, **callback_kwargs)
File "/usr/local/lib/python2.6/dist-packages/django/contrib/auth/
decorators.py" in _wrapped_view
23. return view_func(request, *args, **kwargs)
File "/home/satyajit/geodjango/geographic_admin/permissions/views.py"
in PermLayer
43. perm.table =
ContentType.objects.get(app_label="OsmMap",model="Osm_Layers")
File "/usr/local/lib/python2.6/dist-packages/django/db/models/
manager.py" in get
132. return self.get_query_set().get(*args, **kwargs)
File "/usr/local/lib/python2.6/dist-packages/django/db/models/
query.py" in get
349. % self.model._meta.object_name)

Exception Type: DoesNotExist at /permissions/
Exception Value: ContentType matching query does not exist.

what can be the error ?

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