我是django的新手，正在尝试为在线门户网站在django上进行教程。我已经在两台不同的计算机上完成了以下操作，但出现以下错误：
错误消息
(testenv) C:\Users\bradley\Documents\Web Sites\training>python manage.py runserver
Watching for file changes with StatReloader
Exception in thread Thread-1:
Traceback (most recent call last):
File "C:\Users\bradley\AppData\Local\Continuum\anaconda3\envs\testenv\lib\threading.py", line 917, in _bootstrap_inner
self.run()
File "C:\Users\bradley\AppData\Local\Continuum\anaconda3\envs\testenv\lib\threading.py", line 865, in run
self._target(*self._args, **self._kwargs)
File "C:\Users\bradley\AppData\Local\Continuum\anaconda3\envs\testenv\lib\site-packages\django\utils\autoreload.py", line 54, in wrapper
fn(*args, **kwargs)
File "C:\Users\bradley\AppData\Local\Continuum\anaconda3\envs\testenv\lib\site-packages\django\core\management\commands\runserver.py", line 109, in inner_run
autoreload.raise_last_exception()
File "C:\Users\bradley\AppData\Local\Continuum\anaconda3\envs\testenv\lib\site-packages\django\utils\autoreload.py", line 77, in raise_last_exception
raise _exception[0](_exception[1]).with_traceback(_exception[2])
File "C:\Users\bradley\AppData\Local\Continuum\anaconda3\envs\testenv\lib\site-packages\django\utils\autoreload.py", line 54, in wrapper
fn(*args, **kwargs)
File "C:\Users\bradley\AppData\Local\Continuum\anaconda3\envs\testenv\lib\site-packages\django\__init__.py", line 24, in setup
apps.populate(settings.INSTALLED_APPS)
File "C:\Users\bradley\AppData\Local\Continuum\anaconda3\envs\testenv\lib\site-packages\django\apps\registry.py", line 114, in populate
app_config.import_models()
File "C:\Users\bradley\AppData\Local\Continuum\anaconda3\envs\testenv\lib\site-packages\django\apps\config.py", line 211, in import_models
self.models_module = import_module(models_module_name)
File "C:\Users\bradley\AppData\Local\Continuum\anaconda3\envs\testenv\lib\importlib\__init__.py", line 127, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 1006, in _gcd_import
File "<frozen importlib._bootstrap>", line 983, in _find_and_load
File "<frozen importlib._bootstrap>", line 967, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 677, in _load_unlocked
File "<frozen importlib._bootstrap_external>", line 728, in exec_module
File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
File "C:\Users\bradley\AppData\Local\Continuum\anaconda3\envs\testenv\lib\site-packages\django\contrib\auth\models.py", line 2, in <module>
from django.contrib.auth.base_user import AbstractBaseUser, BaseUserManager
File "C:\Users\bradley\AppData\Local\Continuum\anaconda3\envs\testenv\lib\site-packages\django\contrib\auth\base_user.py", line 47, in <module>
class AbstractBaseUser(models.Model):
File "C:\Users\bradley\AppData\Local\Continuum\anaconda3\envs\testenv\lib\site-packages\django\db\models\base.py", line 117, in __new__
new_class.add_to_class('_meta', Options(meta, app_label))
File "C:\Users\bradley\AppData\Local\Continuum\anaconda3\envs\testenv\lib\site-packages\django\db\models\base.py", line 321, in add_to_class
value.contribute_to_class(cls, name)
File "C:\Users\bradley\AppData\Local\Continuum\anaconda3\envs\testenv\lib\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 "C:\Users\bradley\AppData\Local\Continuum\anaconda3\envs\testenv\lib\site-packages\django\db\__init__.py", line 28, in __getattr__
return getattr(connections[DEFAULT_DB_ALIAS], item)
File "C:\Users\bradley\AppData\Local\Continuum\anaconda3\envs\testenv\lib\site-packages\django\db\utils.py", line 201, in __getitem__
backend = load_backend(db['ENGINE'])
File "C:\Users\bradley\AppData\Local\Continuum\anaconda3\envs\testenv\lib\site-packages\django\db\utils.py", line 110, in load_backend
return import_module('%s.base' % backend_name)
File "C:\Users\bradley\AppData\Local\Continuum\anaconda3\envs\testenv\lib\importlib\__init__.py", line 127, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "C:\Users\bradley\AppData\Local\Continuum\anaconda3\envs\testenv\lib\site-packages\django\db\backends\sqlite3\base.py", line 28, in <module>
from .introspection import DatabaseIntrospection # isort:skip
File "C:\Users\bradley\AppData\Local\Continuum\anaconda3\envs\testenv\lib\site-packages\django\db\backends\sqlite3\introspection.py", line 4, in <module>
import sqlparse
ModuleNotFoundError: No module named 'sqlparse'
Traceback (most recent call last):
File "C:\Users\bradley\AppData\Local\Continuum\anaconda3\envs\testenv\lib\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 "manage.py", line 21, in <module>
main()
File "manage.py", line 17, in main
execute_from_command_line(sys.argv)
File "C:\Users\bradley\AppData\Local\Continuum\anaconda3\envs\testenv\lib\site-packages\django\core\management\__init__.py", line 381, in execute_from_command_line
utility.execute()
File "C:\Users\bradley\AppData\Local\Continuum\anaconda3\envs\testenv\lib\site-packages\django\core\management\__init__.py", line 375, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "C:\Users\bradley\AppData\Local\Continuum\anaconda3\envs\testenv\lib\site-packages\django\core\management\base.py", line 323, in run_from_argv
self.execute(*args, **cmd_options)
File "C:\Users\bradley\AppData\Local\Continuum\anaconda3\envs\testenv\lib\site-packages\django\core\management\commands\runserver.py", line 60, in execute
super().execute(*args, **options)
File "C:\Users\bradley\AppData\Local\Continuum\anaconda3\envs\testenv\lib\site-packages\django\core\management\base.py", line 364, in execute
output = self.handle(*args, **options)
File "C:\Users\bradley\AppData\Local\Continuum\anaconda3\envs\testenv\lib\site-packages\django\core\management\commands\runserver.py", line 95, in handle
self.run(**options)
File "C:\Users\bradley\AppData\Local\Continuum\anaconda3\envs\testenv\lib\site-packages\django\core\management\commands\runserver.py", line 102, in run
autoreload.run_with_reloader(self.inner_run, **options)
File "C:\Users\bradley\AppData\Local\Continuum\anaconda3\envs\testenv\lib\site-packages\django\utils\autoreload.py", line 579, in run_with_reloader
start_django(reloader, main_func, *args, **kwargs)
File "C:\Users\bradley\AppData\Local\Continuum\anaconda3\envs\testenv\lib\site-packages\django\utils\autoreload.py", line 564, in start_django
reloader.run(django_main_thread)
File "C:\Users\bradley\AppData\Local\Continuum\anaconda3\envs\testenv\lib\site-packages\django\utils\autoreload.py", line 272, in run
get_resolver().urlconf_module
File "C:\Users\bradley\AppData\Local\Continuum\anaconda3\envs\testenv\lib\site-packages\django\utils\functional.py", line 80, in __get__
res = instance.__dict__[self.name] = self.func(instance)
File "C:\Users\bradley\AppData\Local\Continuum\anaconda3\envs\testenv\lib\site-packages\django\urls\resolvers.py", line 564, in urlconf_module
return import_module(self.urlconf_name)
File "C:\Users\bradley\AppData\Local\Continuum\anaconda3\envs\testenv\lib\importlib\__init__.py", line 127, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 1006, in _gcd_import
File "<frozen importlib._bootstrap>", line 983, in _find_and_load
File "<frozen importlib._bootstrap>", line 967, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 677, in _load_unlocked
File "<frozen importlib._bootstrap_external>", line 728, in exec_module
File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
File "C:\Users\bradley\Documents\Web Sites\training\training\urls.py", line 20, in <module>
path('admin/', admin.site.urls),
File "C:\Users\bradley\AppData\Local\Continuum\anaconda3\envs\testenv\lib\site-packages\django\utils\functional.py", line 256, in inner
self._setup()
File "C:\Users\bradley\AppData\Local\Continuum\anaconda3\envs\testenv\lib\site-packages\django\contrib\admin\sites.py", line 529, in _setup
AdminSiteClass = import_string(apps.get_app_config('admin').default_site)
File "C:\Users\bradley\AppData\Local\Continuum\anaconda3\envs\testenv\lib\site-packages\django\apps\registry.py", line 162, in get_app_config
raise LookupError(message)
LookupError: No installed app with label 'admin'.