Django ImportError: cannot import name ForumProfile - django

Question

I use virtualenv for django.
And run python manage.py runserver at cmd.
In this site, the questions like importError most of them didn't be
solved.
with my question, some day it can be sovled in the end. >_<
(virtual_env_django_1.7)cundi#cundideAir ~/P/Forum> python manage.py runserver
Traceback (most recent call last):
File "manage.py", line 10, in <module>
execute_from_command_line(sys.argv)
File "/Users/cundi/virtual_env_django_1.7/lib/python2.7/site-packages/django/core/management/__init__.py", line 385, in execute_from_command_line
utility.execute()
File "/Users/cundi/virtual_env_django_1.7/lib/python2.7/site-packages/django/core/management/__init__.py", line 354, in execute
django.setup()
File "/Users/cundi/virtual_env_django_1.7/lib/python2.7/site-packages/django/__init__.py", line 21, in setup
apps.populate(settings.INSTALLED_APPS)
File "/Users/cundi/virtual_env_django_1.7/lib/python2.7/site-packages/django/apps/registry.py", line 108, in populate
app_config.import_models(all_models)
File "/Users/cundi/virtual_env_django_1.7/lib/python2.7/site-packages/django/apps/config.py", line 197, in import_models
self.models_module = import_module(models_module_name)
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/importlib/__init__.py", line 37, in import_module
__import__(name)
File "/Users/cundi/PycharmProjects/Forum/accounts/models.py", line 6, in <module>
from my_forum.models import Topic, Post
File "/Users/cundi/PycharmProjects/Forum/my_forum/models.py", line 9, in <module>
from utils.bbs_utils import get_delta_time
File "/Users/cundi/PycharmProjects/Forum/utils/bbs_utils.py", line 6, in <module>
from utils import conf
File "/Users/cundi/PycharmProjects/Forum/utils/conf.py", line 4, in <module>
from accounts.models import ForumProfile
ImportError: cannot import name ForumProfile
Using google searched similar Error.But has not solve it.
This is my accounts.models.py files.
may be there is a problem.
class BaseSiteUser(models.Model):
# you can get user info like this: user.base_site_user_set.all()[0]
user = models.OneToOneField(User)
class Profile(BaseSiteUser):
nickname = models.CharField(max_length=12, blank=True, null=True)
user_avatar = models.BooleanField(default=True)
avatar_img = models.ImageField(blank=True, null=True, upload_to='avatar', default='avatar/d_avatar.png')
description = models.TextField(null=True, blank=True)
address = models.CharField(max_length=50, null=True, blank=True)
phone = models.CharField(max_length=11, null=True, blank=True)
born_date = models.DateField(
verbose_name=u'出生日期', null=True, blank=True, default=None)
date_created = models.DateField(null=True, blank=True, verbose_name=u'账户创建日期', auto_now_add=True)
class ForumProfile(Profile):
favorite = models.ManyToManyField(Topic, verbose_name='fav_user', related_name='fav', blank=True)
vote = models.ManyToManyField(Topic, verbose_name='vote_user', related_name='vote', blank=True)
coins = models.IntegerField(default=0, blank=True, null=True)
location = models.CharField(max_length=20, blank=True, null=True)
last_activity = models.DateTimeField(auto_now_add=True)
last_posttime = models.DateTimeField(auto_now_add=True)
signature = models.CharField(max_length=128, default='This guy is lazy that nothing to leave')
website = models.URLField(blank=True, null=True)
This is model.py file's some snippet. Hope it will help.
Does has something wrong with settings.py ?
import os
BASE_DIR = os.path.dirname(os.path.dirname(__file__))
SECRET_KEY = '1-ygln+^^7=5=c)u3#2ozm#jiu)6=65m((rg09pwl069242#vc'
DEBUG = True
TEMPLATE_DEBUG = True
ALLOWED_HOSTS = []
# Application definition
INSTALLED_APPS = (
'accounts',
'my_forum',
'utils',
'blog',
'django.contrib.humanize',
'django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
)
MIDDLEWARE_CLASSES = (
'django.contrib.sessions.middleware.SessionMiddleware',
'django.middleware.common.CommonMiddleware',
'django.middleware.csrf.CsrfViewMiddleware',
'django.middleware.locale.LocaleMiddleware',
'django.contrib.auth.middleware.AuthenticationMiddleware',
'django.contrib.messages.middleware.MessageMiddleware',
'django.middleware.clickjacking.XFrameOptionsMiddleware',
)
ROOT_URLCONF = 'Forum.urls'
WSGI_APPLICATION = 'Forum.wsgi.application'
# Database
# https://docs.djangoproject.com/en/1.6/ref/settings/#databases
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.sqlite3',
'NAME': os.path.join(BASE_DIR, 'db.sqlite3'),
}
}
# Internationalization
# https://docs.djangoproject.com/en/1.6/topics/i18n/
LANGUAGE_CODE = 'en-us'
TIME_ZONE = 'Asia/Shanghai'
USE_I18N = True
USE_L10N = True
USE_TZ = True
STATIC_URL = '/static/'
STATIC_ROOT = os.path.join(BASE_DIR, 'static', 'static_root')
STATICFILES_DIRS = (os.path.join(BASE_DIR, 'static', 'static_files'),)
TEMPLATE_DIRS = (
os.path.join(BASE_DIR, 'templates'),
os.path.join(BASE_DIR, 'templates/public'),
)
MAX_UPLOAD_SIZE = "524288"
EMAIL_USE_TLS = True
EMAIL_HOST = ''
EMAIL_PORT = 465
EMAIL_HOST_USER = ''
EMAIL_HOST_PASSWORD = ''
DEFAULT_FROM_EMAIL = EMAIL_HOST_USER
SERVER_EMAIL = EMAIL_HOST_USER
LOCALE_PATHS = (os.path.join(BASE_DIR, 'locale'),)