django配置xadmin的时候报错FieldDoesNotExist Exception Value

django配置xadmin的时候报错FieldDoesNotExist Exception Value:   UserProfile has no field named <function CASCADE at 0x7f95c0517950>

django.core.exceptions.FieldDoesNotExist: ContentType has no field named <function SET_NULL at 0x7fb629e94ea0>