Python Django运行时错误：模型类Django.contrib.contenttypes.models.ContentType错误

我正在使用Django 2。 我得到了这个错误代码，我已经在网上找遍了，没有找到任何答案来修复为什么它一直给我这个错误代码

Traceback (most recent call last):
  File "/home/matthew/anaconda3/lib/python3.6/site-packages/django/utils/autoreload.py", line 225, in wrapper
    fn(*args, **kwargs)
  File "/home/matthew/anaconda3/lib/python3.6/site-packages/django/core/management/commands/runserver.py", line 117, in inner_run
    self.check(display_num_errors=True)
  File "/home/matthew/anaconda3/lib/python3.6/site-packages/django/core/management/base.py", line 379, in check
    include_deployment_checks=include_deployment_checks,
  File "/home/matthew/anaconda3/lib/python3.6/site-packages/django/core/management/base.py", line 366, in _run_checks
    return checks.run_checks(**kwargs)
  File "/home/matthew/anaconda3/lib/python3.6/site-packages/django/core/checks/registry.py", line 71, in run_checks
    new_errors = check(app_configs=app_configs)
  File "/home/matthew/anaconda3/lib/python3.6/site-packages/django/core/checks/urls.py", line 40, in check_url_namespaces_unique
    all_namespaces = _load_all_namespaces(resolver)
  File "/home/matthew/anaconda3/lib/python3.6/site-packages/django/core/checks/urls.py", line 57, in _load_all_namespaces
    url_patterns = getattr(resolver, 'url_patterns', [])
  File "/home/matthew/anaconda3/lib/python3.6/site-packages/django/utils/functional.py", line 37, in __get__
    res = instance.__dict__[self.name] = self.func(instance)
  File "/home/matthew/anaconda3/lib/python3.6/site-packages/django/urls/resolvers.py", line 533, in url_patterns
    patterns = getattr(self.urlconf_module, "urlpatterns", self.urlconf_module)
  File "/home/matthew/anaconda3/lib/python3.6/site-packages/django/utils/functional.py", line 37, in __get__
    res = instance.__dict__[self.name] = self.func(instance)
  File "/home/matthew/anaconda3/lib/python3.6/site-packages/django/urls/resolvers.py", line 526, in urlconf_module
    return import_module(self.urlconf_name)
  File "/home/matthew/anaconda3/lib/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/home/matthew/mykoio/mykoio/urls.py", line 21, in <module>
    path('website/', include('website.urls')),
  File "/home/matthew/anaconda3/lib/python3.6/site-packages/django/urls/conf.py", line 34, in include
    urlconf_module = import_module(urlconf_module)
  File "/home/matthew/anaconda3/lib/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/home/matthew/mykoio/website/urls.py", line 3, in <module>
    from . import views
  File "/home/matthew/mykoio/website/views.py", line 6, in <module>
    from django.contrib.auth.forms import UserCreationForm
  File "/home/matthew/anaconda3/lib/python3.6/site-packages/django/contrib/auth/forms.py", line 10, in <module>
    from django.contrib.auth.models import User
  File "/home/matthew/anaconda3/lib/python3.6/site-packages/django/contrib/auth/models.py", line 3, in <module>
    from django.contrib.contenttypes.models import ContentType
  File "/home/matthew/anaconda3/lib/python3.6/site-packages/django/contrib/contenttypes/models.py", line 134, in <module>
    class ContentType(models.Model):
  File "/home/matthew/anaconda3/lib/python3.6/site-packages/django/db/models/base.py", line 95, in __new__
    "INSTALLED_APPS." % (module, name)
RuntimeError: Model class django.contrib.contenttypes.models.ContentType doesn't declare an explicit app_label and isn't in an application in INSTALLED_APPS.

---

出于某种原因，我拥有人们推荐的所有应用程序，我尝试了它们，无论发生什么，我都会得到相同的错误代码。我现在所能想到的是，Django代码在更深层次上出现了问题。

已安装的应用程序=['Django.contrib.admin'，'Django.contrib.auth'，'Django.contrib.auth.views'，'Django.contrib.contenttypes'，'Django.contrib.sessions'，'Django.contrib.messages'，'Django.contrib.staticfiles'，'website']

---

这应该行。

您好，请检查以下问题：？我想这可能是同样的问题。顺便说一句，你的项目名为mykoio，它包含一个名为website right？的应用程序，那么为什么这个应用程序不在已安装的应用程序中？好的，我尝试了第一个问题的建议，得到了相同的错误代码。我尝试将网站放入已安装的应用程序中，但并没有修复任何问题。您尝试了哪些建议？那么现在安装的应用程序看起来是什么样子呢？安装的应用程序=['mykoio.apps.mykoioConfig'，'django.contrib.admin'，'django.contrib.auth'，'django.contrib.auth.views'，'django.contrib.contenttypes'，'django.contrib.sessions'，'django.contrib.messages'，'django.contrib.staticfiles'，'mykoio.apps.website'，]

INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.auth.views',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
]