为什么使用find_element_by_xpath方法的时候属性值总会报错？求解

# -*- coding:utf-8 -*
from selenium import webdriver
import time

driver = webdriver.Chrome('D:\python3.6.8\Scripts\chromedriver.exe')
driver.get('http://0002.yun.')
driver.maximize_window()
time.sleep(1)
driver.find_element_by_id('user').send_keys('lyy')      # 输入登录账号
driver.find_element_by_id('password').send_keys('123456')       # 输入登录密码
time.sleep(1)
# -----------Xpath--------------
driver.find_element_by_xpath('/html/body/div/form/div/button').click()  # 点击登录按钮
time.sleep(1)
driver.find_element_by_id('ext-comp-1020').click()          # 点击【健康管理】模块
driver.find_element_by_xpath("//div[@id="ext-comp-1020"]/")        # id属性值报错