no such table이라고 뜨는 오류좀 봐주세요

1분35초경의 강의를 따라하다가 다음과 같은 에러가 발생합니다.

>>> post= Post.objects.create(title="this is title", content="this is content")

Traceback (most recent call last):

  File "/home/beanzsoft/Projects/HelloDjango/venv/lib/python3.6/site-packages/django/db/backends/utils.py", line 84, in _execute

    return self.cursor.execute(sql, params)

  File "/home/beanzsoft/Projects/HelloDjango/venv/lib/python3.6/site-packages/django/db/backends/sqlite3/base.py", line 383, in execute

    return Database.Cursor.execute(self, query, params)

sqlite3.OperationalError: no such table: second_post

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

Traceback (most recent call last):

  File "<console>", line 1, in <module>

  File "/home/beanzsoft/Projects/HelloDjango/venv/lib/python3.6/site-packages/django/db/models/manager.py", line 82, in manager_method

    return getattr(self.get_queryset(), name)(*args, **kwargs)

  File "/home/beanzsoft/Projects/HelloDjango/venv/lib/python3.6/site-packages/django/db/models/query.py", line 422, in create

    obj.save(force_insert=True, using=self.db)

  File "/home/beanzsoft/Projects/HelloDjango/venv/lib/python3.6/site-packages/django/db/models/base.py", line 741, in save

    force_update=force_update, update_fields=update_fields)

  File "/home/beanzsoft/Projects/HelloDjango/venv/lib/python3.6/site-packages/django/db/models/base.py", line 779, in save_base

    force_update, using, update_fields,

  File "/home/beanzsoft/Projects/HelloDjango/venv/lib/python3.6/site-packages/django/db/models/base.py", line 870, in _save_table

    result = self._do_insert(cls._base_manager, using, fields, update_pk, raw)

  File "/home/beanzsoft/Projects/HelloDjango/venv/lib/python3.6/site-packages/django/db/models/base.py", line 908, in _do_insert

    using=using, raw=raw)

  File "/home/beanzsoft/Projects/HelloDjango/venv/lib/python3.6/site-packages/django/db/models/manager.py", line 82, in manager_method

    return getattr(self.get_queryset(), name)(*args, **kwargs)

  File "/home/beanzsoft/Projects/HelloDjango/venv/lib/python3.6/site-packages/django/db/models/query.py", line 1186, in _insert

    return query.get_compiler(using=using).execute_sql(return_id)

  File "/home/beanzsoft/Projects/HelloDjango/venv/lib/python3.6/site-packages/django/db/models/sql/compiler.py", line 1335, in execute_sql

    cursor.execute(sql, params)

  File "/home/beanzsoft/Projects/HelloDjango/venv/lib/python3.6/site-packages/django/db/backends/utils.py", line 99, in execute

    return super().execute(sql, params)

  File "/home/beanzsoft/Projects/HelloDjango/venv/lib/python3.6/site-packages/django/db/backends/utils.py", line 67, in execute

    return self._execute_with_wrappers(sql, params, many=False, executor=self._execute)

  File "/home/beanzsoft/Projects/HelloDjango/venv/lib/python3.6/site-packages/django/db/backends/utils.py", line 76, in _execute_with_wrappers

    return executor(sql, params, many, context)

  File "/home/beanzsoft/Projects/HelloDjango/venv/lib/python3.6/site-packages/django/db/backends/utils.py", line 84, in _execute

    return self.cursor.execute(sql, params)

  File "/home/beanzsoft/Projects/HelloDjango/venv/lib/python3.6/site-packages/django/db/utils.py", line 89, in __exit__

    raise dj_exc_value.with_traceback(traceback) from exc_value

  File "/home/beanzsoft/Projects/HelloDjango/venv/lib/python3.6/site-packages/django/db/backends/utils.py", line 84, in _execute

    return self.cursor.execute(sql, params)

  File "/home/beanzsoft/Projects/HelloDjango/venv/lib/python3.6/site-packages/django/db/backends/sqlite3/base.py", line 383, in execute

    return Database.Cursor.execute(self, query, params)

django.db.utils.OperationalError: no such table: second_post