求解这TypeError: Flask.__init__() got an unexpected keyword argument 'template_folser'是什么情况

问题遇到的现象和发生背景

我在按照这篇文章配置环境时报错

问题相关代码，请勿粘贴截图

from flask import Flask

import setting
from exts import db


def create_app():
    app = Flask(__name__, template_folser='../templates', static_folder='../static')

    app.config.from_object(setting.DevelopmentConfig)

    # 初始化ORM
    db.init_app(app=app)

    return app

运行结果及报错内容

E:\python\flaskProject>python app.py db init
Traceback (most recent call last):
  File "E:\python\flaskProject\app.py", line 9, in <module>
    app = create_app()
  File "E:\python\flaskProject\apps\__init__.py", line 8, in create_app
    app = Flask(__name__, template_folser='../templates', static_folder='../static')
TypeError: Flask.__init__() got an unexpected keyword argument 'template_folser'

E:\python\flaskProject>

尝试了很多办法没解决，请帮忙解答，谢谢

template_folder 不是 template_folser

确实是参数名字写错了template_folder