问为什么这段代码显示错误的消息(忽略使用python的第一个XML元素)

EN

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<Root>
    <Story>
        <ul>
            <li><a href="#">some link</a></li>
            <li><a href="#">some link 2</a></li>
            <li><a href="#">link i want to find</a></li>
       </ul>
    </Story>
</Root>

import xml.etree.ElementTree as ET

tree = ET.parse("C:\\ignore_first.xml")
root = tree.getroot()

ignore_first = root.findall('.//li[position()>1]')

print(ignore_first)