Django 当运行runserver时；LookupError:未安装标签为'；管理员'&引用；发生

我的Django项目是由2.0.8创建的，我想更新Django的版本，因为文档中说“此文档针对的是不再受支持的不安全的Django版本。请升级到较新的版本！”。更新后，当我重新使用命令

python manager.py runserver

”时，出现了以下错误：

"Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/threading.py", line 916, in _bootstrap_inner
    self.run()
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/threading.py", line 864, in run
    self._target(*self._args, **self._kwargs)
  File "/Users/duke/Documents/python/django_test/env/lib/python3.6/site-packages/django/utils/autoreload.py", line 54, in wrapper
    fn(*args, **kwargs)
  File "/Users/duke/Documents/python/django_test/env/lib/python3.6/site-packages/django/core/management/commands/runserver.py", line 109, in inner_run
    autoreload.raise_last_exception()
  File "/Users/duke/Documents/python/django_test/env/lib/python3.6/site-packages/django/utils/autoreload.py", line 77, in raise_last_exception
    raise _exception[0](_exception[1]).with_traceback(_exception[2])
  File "/Users/duke/Documents/python/django_test/env/lib/python3.6/site-packages/django/utils/autoreload.py", line 54, in wrapper
    fn(*args, **kwargs)
  File "/Users/duke/Documents/python/django_test/env/lib/python3.6/site-packages/django/__init__.py", line 24, in setup
    apps.populate(settings.INSTALLED_APPS)
  File "/Users/duke/Documents/python/django_test/env/lib/python3.6/site-packages/django/apps/registry.py", line 114, in populate
    app_config.import_models()
  File "/Users/duke/Documents/python/django_test/env/lib/python3.6/site-packages/django/apps/config.py", line 211, in import_models
    self.models_module = import_module(models_module_name)
  File "/Library/Frameworks/Python.framework/Versions/3.6/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 "/Users/duke/Documents/python/django_test/env/lib/python3.6/site-packages/django/contrib/auth/models.py", line 2, in <module>
    from django.contrib.auth.base_user import AbstractBaseUser, BaseUserManager
  File "/Users/duke/Documents/python/django_test/env/lib/python3.6/site-packages/django/contrib/auth/base_user.py", line 47, in <module>
    class AbstractBaseUser(models.Model):
  File "/Users/duke/Documents/python/django_test/env/lib/python3.6/site-packages/django/db/models/base.py", line 117, in __new__
    new_class.add_to_class('_meta', Options(meta, app_label))
  File "/Users/duke/Documents/python/django_test/env/lib/python3.6/site-packages/django/db/models/base.py", line 321, in add_to_class
    value.contribute_to_class(cls, name)
  File "/Users/duke/Documents/python/django_test/env/lib/python3.6/site-packages/django/db/models/options.py", line 204, in contribute_to_class
    self.db_table = truncate_name(self.db_table, connection.ops.max_name_length())
  File "/Users/duke/Documents/python/django_test/env/lib/python3.6/site-packages/django/db/__init__.py", line 28, in __getattr__
    return getattr(connections[DEFAULT_DB_ALIAS], item)
  File "/Users/duke/Documents/python/django_test/env/lib/python3.6/site-packages/django/db/utils.py", line 201, in __getitem__
    backend = load_backend(db['ENGINE'])
  File "/Users/duke/Documents/python/django_test/env/lib/python3.6/site-packages/django/db/utils.py", line 110, in load_backend
    return import_module('%s.base' % backend_name)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "/Users/duke/Documents/python/django_test/env/lib/python3.6/site-packages/django/db/backends/mysql/base.py", line 36, in <module>
    raise ImproperlyConfigured('mysqlclient 1.3.13 or newer is required; you have %s.' % Database.__version__)
django.core.exceptions.ImproperlyConfigured: mysqlclient 1.3.13 or newer is required; you have 0.9.3.

Traceback (most recent call last):
  File "/Users/duke/Documents/python/django_test/env/lib/python3.6/site-packages/django/apps/registry.py", line 155, in get_app_config
    return self.app_configs[app_label]
KeyError: 'admin'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "../KitCat/manage.py", line 15, in <module>
    execute_from_command_line(sys.argv)
  File "/Users/duke/Documents/python/django_test/env/lib/python3.6/site-packages/django/core/management/__init__.py", line 381, in execute_from_command_line
    utility.execute()
  File "/Users/duke/Documents/python/django_test/env/lib/python3.6/site-packages/django/core/management/__init__.py", line 375, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/Users/duke/Documents/python/django_test/env/lib/python3.6/site-packages/django/core/management/base.py", line 323, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/Users/duke/Documents/python/django_test/env/lib/python3.6/site-packages/django/core/management/commands/runserver.py", line 60, in execute
    super().execute(*args, **options)
  File "/Users/duke/Documents/python/django_test/env/lib/python3.6/site-packages/django/core/management/base.py", line 364, in execute
    output = self.handle(*args, **options)
  File "/Users/duke/Documents/python/django_test/env/lib/python3.6/site-packages/django/core/management/commands/runserver.py", line 95, in handle
    self.run(**options)
  File "/Users/duke/Documents/python/django_test/env/lib/python3.6/site-packages/django/core/management/commands/runserver.py", line 102, in run
    autoreload.run_with_reloader(self.inner_run, **options)
  File "/Users/duke/Documents/python/django_test/env/lib/python3.6/site-packages/django/utils/autoreload.py", line 579, in run_with_reloader
    start_django(reloader, main_func, *args, **kwargs)
  File "/Users/duke/Documents/python/django_test/env/lib/python3.6/site-packages/django/utils/autoreload.py", line 564, in start_django
    reloader.run(django_main_thread)
  File "/Users/duke/Documents/python/django_test/env/lib/python3.6/site-packages/django/utils/autoreload.py", line 272, in run
    get_resolver().urlconf_module
  File "/Users/duke/Documents/python/django_test/env/lib/python3.6/site-packages/django/utils/functional.py", line 80, in __get__
    res = instance.__dict__[self.name] = self.func(instance)
  File "/Users/duke/Documents/python/django_test/env/lib/python3.6/site-packages/django/urls/resolvers.py", line 564, in urlconf_module
    return import_module(self.urlconf_name)
  File "/Library/Frameworks/Python.framework/Versions/3.6/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 "/Users/duke/Documents/python/KitCat/KitCat/urls.py", line 21, in <module>
    path('admin/', admin.site.urls),
  File "/Users/duke/Documents/python/django_test/env/lib/python3.6/site-packages/django/utils/functional.py", line 256, in inner
    self._setup()
  File "/Users/duke/Documents/python/django_test/env/lib/python3.6/site-packages/django/contrib/admin/sites.py", line 529, in _setup
    AdminSiteClass = import_string(apps.get_app_config('admin').default_site)
  File "/Users/duke/Documents/python/django_test/env/lib/python3.6/site-packages/django/apps/registry.py", line 162, in get_app_config
    raise LookupError(message)
LookupError: No installed app with label 'admin'."

“回溯（最近一次呼叫最后一次）：
文件“/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/threading.py”，第916行，在bootstrap\u内部
self.run（）
文件“/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/threading.py”，第864行，正在运行
自我目标（*自我参数，**自我参数）
文件“/Users/duke/Documents/python/django_test/env/lib/python3.6/site packages/django/utils/autoreload.py”，第54行，在包装器中
fn（*args，**kwargs）
文件“/Users/duke/Documents/python/django_test/env/lib/python3.6/site packages/django/core/management/commands/runserver.py”，第109行，在内部运行
autoreload.raise\u last\u异常（）
文件“/Users/duke/Documents/python/django_test/env/lib/python3.6/site packages/django/utils/autoreload.py”，第77行，在raise_last_异常中
引发异常[0]（\u异常[1]）。并进行跟踪（\u异常[2]）
文件“/Users/duke/Documents/python/django_test/env/lib/python3.6/site packages/django/utils/autoreload.py”，第54行，在包装器中
fn（*args，**kwargs）
文件“/Users/duke/Documents/python/django_test/env/lib/python3.6/site packages/django/_init__.py”，第24行，在安装程序中
应用程序。填充（设置。已安装的应用程序）
文件“/Users/duke/Documents/python/django_test/env/lib/python3.6/site packages/django/apps/registry.py”，第114行，填充
app_config.import_models（）
导入模型中的文件“/Users/duke/Documents/python/django_test/env/lib/python3.6/site packages/django/apps/config.py”，第211行
self.models\u module=导入模块（models\u module\u name）
文件“/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/importlib/\uuuu init\uuuu.py”，第126行，在导入模块中
return _bootstrap._gcd_import（名称[级别：]，包，级别）
文件“”，第994行，在_gcd_导入中
文件“”，第971行，在_find_和_load中
文件“”，第955行，在“查找”和“加载”中解锁
文件“”，第665行，在“加载”中
exec_模块中第678行的文件“”
文件“”，第219行，在“调用”中，删除了“帧”
文件“/Users/duke/Documents/python/django_test/env/lib/python3.6/site packages/django/contrib/auth/models.py”，第2行，在
从django.contrib.auth.base_user导入AbstractBaseUser、BaseUserManager
文件“/Users/duke/Documents/python/django_test/env/lib/python3.6/site packages/django/contrib/auth/base_user.py”，第47行
类AbstractBaseUser（models.Model）：
文件“/Users/duke/Documents/python/django_test/env/lib/python3.6/site packages/django/db/models/base.py”，第117行，在新的__
新建类。将类添加到类（“元”，选项（元，应用标签））
文件“/Users/duke/Documents/python/django_test/env/lib/python3.6/site packages/django/db/models/base.py”，第321行，在add_to_类中
值。贡献给类（cls，名称）
文件“/Users/duke/Documents/python/django_test/env/lib/python3.6/site packages/django/db/models/options.py”，第204行，在contribution_to_类中
self.db\u table=truncate\u name（self.db\u table，connection.ops.max\u name\u length（））
文件“/Users/duke/Documents/python/django_test/env/lib/python3.6/site packages/django/db/_init__.py”，第28行，在__
返回getattr（连接[默认\u DB\u别名]，项）
文件“/Users/duke/Documents/python/django_test/env/lib/python3.6/site packages/django/db/utils.py”，第201行，在__
后端=加载\u后端（db['ENGINE']）
文件“/Users/duke/Documents/python/django_test/env/lib/python3.6/site packages/django/db/utils.py”，第110行，在load_后端
返回导入\u模块（“%s.base”%backend\u名称）
文件“/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/importlib/\uuuu init\uuuu.py”，第126行，在导入模块中
return _bootstrap._gcd_import（名称[级别：]，包，级别）
文件“/Users/duke/Documents/python/django_test/env/lib/python3.6/site packages/django/db/backends/mysql/base.py”，第36行
raise配置不正确（'需要mysqlclient 1.3.13或更新版本；您有%s.%的数据库。\版本\uuuu）
django.core.exceptions.ImpropertlyConfigured:需要mysqlclient 1.3.13或更新版本；您有0.9.3。
回溯（最近一次呼叫最后一次）：
文件“/Users/duke/Documents/python/django_test/env/lib/python3.6/site packages/django/apps/registry.py”，第155行，在get_app_config中
返回self.app\u配置[app\u标签]
KeyError:'管理员'
在处理上述异常期间，发生了另一个异常：
回溯（最近一次呼叫最后一次）：
文件“./KitCat/manage.py”，第15行，在
从命令行（sys.argv）执行命令
文件“/Users/duke/Documents/python/django_test/env/lib/python3.6/site packages/django/core/management/___init__.py”，第381行，从命令行执行
utility.execute（）
文件“/Users/duke/Documents/python/django_test/env/lib/python3.6/site packages/django/core/management/__init___;.py”，执行中第375行
self.fetch_命令（子命令）。从_argv（self.argv）运行_
文件“/Users/duke/Documents/python/django_test/env/lib/python3.6/site packages/django/core/management/base.py”，第323行，从_argv运行
self.execute（*args，**cmd_选项）
文件“/Users/duke/Documents/python/django_test/env/lib/python3.6/site packages/django/core/management/commands/runserver.py”，第60行，在execute中
super（）.execute（*args，**选项）
文件“/Users/duke/Documents/python/django_test/env/lib/python3.6/site packages/django/core/management/base.py”，第364行，在execute中
输出=self.handle（*args，**选项）
文件“/Users/duke/Documents/python/django_test/env/lib/python3.6/site packages/django/core/management/commands/runserver.py”，第95行，在handle中
self.run（**选项）
文件“/用户/duke/Docum
django.core.exceptions.ImproperlyConfigured: mysqlclient 1.3.13 or newer is required; you have 0.9.3.