perms field error

traceback.json

{
    "error_message": "'Collection' object has no attribute 'collection'",
    "traceback": "Traceback (most recent call last):\n\n  File \"/Users/aleck/.virtualenvs/ninu/src/django-tastypie/tastypie/resources.py\", line 193, in wrapper\n    response = callback(request, *args, **kwargs)\n\n  File \"/Users/aleck/.virtualenvs/ninu/src/django-tastypie/tastypie/resources.py\", line 409, in dispatch_detail\n    return self.dispatch('detail', request, **kwargs)\n\n  File \"/Users/aleck/.virtualenvs/ninu/src/django-tastypie/tastypie/resources.py\", line 429, in dispatch\n    response = method(request, **kwargs)\n\n  File \"/Users/aleck/Code/ninu_top/nsite/api/resources.py\", line 61, in put_detail\n    updated_bundle = self.obj_update(bundle, request=request, **self.remove_api_resource_names(kwargs))\n\n  File \"/Users/aleck/.virtualenvs/ninu/src/django-tastypie/tastypie/resources.py\", line 1932, in obj_update\n    return self.save(bundle)\n\n  File \"/Users/aleck/.virtualenvs/ninu/src/django-tastypie/tastypie/resources.py\", line 2002, in save\n    self.save_m2m(m2m_bundle)\n\n  File \"/Users/aleck/.virtualenvs/ninu/src/django-tastypie/tastypie/resources.py\", line 2086, in save_m2m\n    related_resource.save(related_bundle)\n\n  File \"/Users/aleck/.virtualenvs/ninu/src/django-tastypie/tastypie/resources.py\", line 1995, in save\n    self.save_related(bundle)\n\n  File \"/Users/aleck/.virtualenvs/ninu/src/django-tastypie/tastypie/resources.py\", line 2032, in save_related\n    related_obj = getattr(bundle.obj, field_object.attribute)\n\nAttributeError: 'Collection' object has no attribute 'collection'\n"
}