xhs包，返回值报错如下： about xhs HOT 7 CLOSED

import requests
from xhs import XhsClient

cookie = "please get cookie in website"
def sign(uri, data=None, a1=""):
    """You can implement this sign function on your own."""
    res = requests.post("http://127.0.0.1:5000/xhs/sign", json={
        "uri": uri,
        "data": data,
        "a1": a1
    })
    return res.json()

xhs_client = XhsClient(cookie, sign=sign)