报错信息如下：

sqlalchemy.exc.OperationalError
sqlalchemy.exc.OperationalError: (sqlite3.OperationalError) no such table: user [SQL: ‘SELECT user.uid AS user_uid, user.nickname AS user_nickname, user.mobile AS user_mobile, user.email AS user_email, user.sex AS user_sex, user.avatar AS user_avatar, user.login_name AS user_login_name, user.login_pwd AS user_login_pwd, user.login_salt AS user_login_salt, user.status AS user_status, user.updated_time AS user_updated_time, user.created_time AS user_created_time \nFROM user \nWHERE user.login_name = ?\n LIMIT ? OFFSET ?’] [parameters: (‘54php.cn’, 1, 0)] (Background on this error at: http://sqlalche.me/e/e3q8)

查了相关解决办法上说使用db.create_all()来解决，但是解决不了，请教一下老师这个错误怎么处理？