django创建的blog出错：list index out of range 必须要有app，djangoapp,django创建的blo

django创建的blog出错：list index out of range 必须要有app，djangoapp,django创建的blo

django创建的blog出错：list index out of range 必须要有app，原本是可以用的，博客是项目下的一个app。后来我把博客升级为项目，不再做为为项目下一个app，做了一些修改。出现了如下错误。所有页面都是类似错误。

Environment:Request Method: GETRequest URL: http://127.0.0.1:8000/admin/Django Version: 1.6.2Python Version: 3.4.0Installed Applications:('django.contrib.admin', 'django.contrib.auth', 'django.contrib.contenttypes', 'django.contrib.sessions', 'django.contrib.messages', 'django.contrib.staticfiles')Installed Middleware:('django.contrib.sessions.middleware.SessionMiddleware', 'django.middleware.common.CommonMiddleware', 'django.middleware.csrf.CsrfViewMiddleware', 'django.contrib.auth.middleware.AuthenticationMiddleware', 'django.contrib.messages.middleware.MessageMiddleware', 'django.middleware.clickjacking.XFrameOptionsMiddleware')Traceback:File "/usr/local/lib/python3.4/dist-packages/django/core/handlers/base.py" in get_response  114.                     response = wrapped_callback(request, *callback_args, **callback_kwargs)File "/usr/local/lib/python3.4/dist-packages/django/contrib/admin/sites.py" in wrapper  215.                 return self.admin_view(view, cacheable)(*args, **kwargs)File "/usr/local/lib/python3.4/dist-packages/django/utils/decorators.py" in _wrapped_view  99.                     response = view_func(request, *args, **kwargs)File "/usr/local/lib/python3.4/dist-packages/django/views/decorators/cache.py" in _wrapped_view_func  52.         response = view_func(request, *args, **kwargs)File "/usr/local/lib/python3.4/dist-packages/django/contrib/admin/sites.py" in inner  198.             return view(request, *args, **kwargs)File "/usr/local/lib/python3.4/dist-packages/django/views/decorators/cache.py" in _wrapped_view_func  52.         response = view_func(request, *args, **kwargs)File "/usr/local/lib/python3.4/dist-packages/django/contrib/admin/sites.py" in index  358.                             model_dict['admin_url'] = reverse('admin:%s_%s_changelist' % info, current_app=self.name)File "/usr/local/lib/python3.4/dist-packages/django/core/urlresolvers.py" in reverse  480.                 app_list = resolver.app_dict[ns]File "/usr/local/lib/python3.4/dist-packages/django/core/urlresolvers.py" in app_dict  310.             self._populate()File "/usr/local/lib/python3.4/dist-packages/django/core/urlresolvers.py" in _populate  285.                 lookups.appendlist(pattern.callback, (bits, p_pattern, pattern.default_args))File "/usr/local/lib/python3.4/dist-packages/django/core/urlresolvers.py" in callback  229.         self._callback = get_callable(self._callback_str)File "/usr/local/lib/python3.4/dist-packages/django/utils/functional.py" in wrapper  32.         result = func(*args)File "/usr/local/lib/python3.4/dist-packages/django/core/urlresolvers.py" in get_callable  96.             mod = import_module(mod_name)File "/usr/lib/python3.4/importlib/__init__.py" in import_module  109.     return _bootstrap._gcd_import(name[level:], package, level)File "/home/caosz/ilemon/views.py" in <module>  2. from models import BlogFile "/home/caosz/ilemon/models.py" in <module>  4. class Tag(models.Model):File "/usr/local/lib/python3.4/dist-packages/django/db/models/base.py" in __new__  92.             kwargs = {"app_label": model_module.__name__.split('.')[-2]}Exception Type: IndexError at /admin/Exception Value: list index out of range

model.py如下：

from django.db import models# Create your models here.class Tag(models.Model):    tag_name = models.CharField(max_length=20)    create_time = models.DateTimeField(auto_now_add=True)    def __str__(self):        return self.tag_nameclass Author(models.Model):    name = models.CharField(max_length=30)    email = models.EmailField()    def __str__(self):        return self.nameclass Blog(models.Model):    caption = models.CharField(max_length=50)    author = models.ForeignKey(Author)    tags = models.ManyToManyField(Tag, blank=True)    content = models.TextField()    publish_time = models.DateTimeField(auto_now_add=True)    update_time = models.DateTimeField(auto_now=True)    def __str__(self):        return self.caption + str(self.author) + str(self.publish_time)    class Meta:        ordering = ['-publish_time']

经过查阅资料：
要使用model必须要有app，新建app里面可以没有url.py，这样不影响url简短

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