我是win10系统，用的pycharm，python版本为3.6

在生成测试sqlite时，执行python manage.py makemigrations
报错如下：
Traceback (most recent call last):
File "E:\python_envs\answer_question\lib\site-packages\django\db\backends\utils.py", line 85, in _execute
return self.cursor.execute(sql, params)
File "E:\python_envs\answer_question\lib\site-packages\django\db\backends\sqlite3\base.py", line 303, in execute
return Database.Cursor.execute(self, query, params)
sqlite3.OperationalError: no such table: NTWebsite_preferredconfigname

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
File "manage.py", line 15, in
execute_from_command_line(sys.argv)
File "E:\python_envs\answer_question\lib\site-packages\django\core\management_init_.py", line 371, in execute_from_command_line
utility.execute()
File "E:\python_envs\answer_question\lib\site-packages\django\core\management_init_.py", line 347, in execute
django.setup()
File "E:\python_envs\answer_question\lib\site-packages\django_init_.py", line 24, in setup
apps.populate(settings.INSTALLED_APPS)
File "E:\python_envs\answer_question\lib\site-packages\django\apps\registry.py", line 120, in populate
app_config.ready()
File "E:\python_envs\answer_question\lib\site-packages\django\contrib\admin\apps.py", line 23, in ready
self.module.autodiscover()
File "E:\python_envs\answer_question\lib\site-packages\django\contrib\admin_init_.py", line 26, in autodiscover
autodiscover_modules('admin', register_to=site)
File "E:\python_envs\answer_question\lib\site-packages\django\utils\module_loading.py", line 47, in autodiscover_modules
import_module('%s.%s' % (app_config.name, module_to_search))
File "D:\Python36\lib\importlib_init_.py", line 126, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "", line 994, in _gcd_import
File "", line 971, in _find_and_load
File "", line 955, in _find_and_load_unlocked
File "", line 665, in load_unlocked
File "", line 678, in exec_module
File "", line 219, in call_with_frames_removed
File "E:\python_projects\answer_question\NTWebsite\admin.py", line 1, in
from .improtFiles.models_import_head import *
File "E:\python_projects\answer_question\NTWebsite\improtFiles_init.py", line 1, in
from .views_import_head import *
File "E:\python_projects\answer_question\NTWebsite\improtFiles\views_import_head_init.py", line 1, in
from .views_import_file import *
File "E:\python_projects\answer_question\NTWebsite\improtFiles\views_import_head\views_import_file.py", line 2, in
from NTWebsite.MainMethods import QueryRedisCache as QRC
File "E:\python_projects\answer_question\NTWebsite\MainMethods.py", line 29, in
APPConf = AC()
File "E:\python_projects\answer_question\NTWebsite\Config.py", line 17, in init
0].Name.Name
File "E:\python_envs\answer_question\lib\site-packages\django\db\models\query.py", line 306, in getitem
qs._fetch_all()
File "E:\python_envs\answer_question\lib\site-packages\django\db\models\query.py", line 1179, in _fetch_all
self._result_cache = list(self._iterable_class(self))
File "E:\python_envs\answer_question\lib\site-packages\django\db\models\query.py", line 53, in iter
results = compiler.execute_sql(chunked_fetch=self.chunked_fetch, chunk_size=self.chunk_size)
File "E:\python_envs\answer_question\lib\site-packages\django\db\models\sql\compiler.py", line 1068, in execute_sql
cursor.execute(sql, params)
File "E:\python_envs\answer_question\lib\site-packages\django\db\backends\utils.py", line 100, in execute
return super().execute(sql, params)
File "E:\python_envs\answer_question\lib\site-packages\django\db\backends\utils.py", line 68, in execute
return self._execute_with_wrappers(sql, params, many=False, executor=self._execute)
File "E:\python_envs\answer_question\lib\site-packages\django\db\backends\utils.py", line 77, in _execute_with_wrappers
return executor(sql, params, many, context)
File "E:\python_envs\answer_question\lib\site-packages\django\db\backends\utils.py", line 85, in _execute
return self.cursor.execute(sql, params)
File "E:\python_envs\answer_question\lib\site-packages\django\db\utils.py", line 89, in exit
raise dj_exc_value.with_traceback(traceback) from exc_value
File "E:\python_envs\answer_question\lib\site-packages\django\db\backends\utils.py", line 85, in _execute
return self.cursor.execute(sql, params)
File "E:\python_envs\answer_question\lib\site-packages\django\db\backends\sqlite3\base.py", line 303, in execute
return Database.Cursor.execute(self, query, params)
django.db.utils.OperationalError: no such table: NTWebsite_preferredconfigname

请问是什么原因啊？