运用livereload自动更新

# coding=utf-8
from flask import Flask,request, make_response, jsonify, render_template, url_for
from flask_bootstrap import Bootstrap
from flask_script import Manager

app = Flask(__name__)
app.config.from_pyfile('config')
bootstrap = Bootstrap(app)

manager = Manager(app)

@app.route('/article')
def hello_world():
    return render_template('article.html')

@manager.command
def dev():
    from livereload import Server
    live_server = Server(app.wsgi_app)
    live_server.watch('**/*.*')  # 监测整个项目所有文件变化。可以加参数，不加就整个项目重加载，加的话就执行方法里的内容。
    live_server.serve(open_url=True)

if __name__ == '__main__':
    manager.run()

出现错误

解决办法