flask db upgrade 명령어를 사용했는데, 계속해서 이런 오류가 나옵니다.
(...중략...)
e 376, in drop_table
self.exec(schema.DropTable(table))
File "/home/ubuntu/venvs/myproject/lib/python3.8/site-packages/alembic/ddl/impl.py", lin
e 197, in _exec
return conn.execute(construct, multiparams)
File "/home/ubuntu/venvs/myproject/lib/python3.8/site-packages/sqlalchemy/engine/base.py
", line 1289, in execute
return meth(self, multiparams, params, _EMPTY_EXECUTION_OPTS)
File "/home/ubuntu/venvs/myproject/lib/python3.8/site-packages/sqlalchemy/sql/ddl.py", l
ine 77, in _execute_on_connection
return connection._execute_ddl(
File "/home/ubuntu/venvs/myproject/lib/python3.8/site-packages/sqlalchemy/engine/base.py
", line 1381, in _execute_ddl
ret = self._execute_context(
File "/home/ubuntu/venvs/myproject/lib/python3.8/site-packages/sqlalchemy/engine/base.py
", line 1845, in _execute_context
self._handle_dbapi_exception(
File "/home/ubuntu/venvs/myproject/lib/python3.8/site-packages/sqlalchemy/engine/base.py
", line 2026, in _handle_dbapi_exception
util.raise(
File "/home/ubuntu/venvs/myproject/lib/python3.8/site-packages/sqlalchemy/util/compat.py
", line 207, in raise_
raise exception
File "/home/ubuntu/venvs/myproject/lib/python3.8/site-packages/sqlalchemy/engine/base.py
", line 1802, in _execute_context
self.dialect.do_execute(
File "/home/ubuntu/venvs/myproject/lib/python3.8/site-packages/sqlalchemy/engine/default
.py", line 719, in do_execute
cursor.execute(statement, parameters)
sqlalchemy.exc.OperationalError: (sqlite3.OperationalError) no such table: _alembic_tmp_qu
estion
[SQL:
DROP TABLE _alembic_tmp_question]
(Background on this error at: https://sqlalche.me/e/14/e3q8)

저번에 데이터베이스 관련 실습할 때에도 가끔 굵게 표시된 오류가 자주 나오는데, 원인이 무엇이고 어떻게 하면 좋을까요?