____按照《Flask Web开发》第6章“电子邮件”写的，在shell里创建Message实例的时候为什么会出现这样的错误？
from flask import Flask
from flask.ext.mail import Mail
from flask.ext.script import Manager
app = Flask(__name__)
app.config['MAIL_SERVER']='smtp.qq.com'
app.config['MAIL_PORT']=25
app.config['MAIL_USE_TLS']=True
app.config['MAIL_USERNAME']='*********@qq.com'
app.config['MAIL_PASSWORD']='dtrlrascktqqbhej'
mail=Mail(app)
manager=Manager(app)
@app.route('/')
def hello_world():
return 'Hello World!'
if name == '__main__':
manager.run()
