为什么我的XML解析数据不能写入我的CSV？

import csv
import xml.etree.ElementTree as ET

# 解析XML文件
tree = ET.parse('data.xml')
root = tree.getroot()

# 打开CSV文件
with open('output.csv', 'w', newline='', encoding='utf-8') as csvfile:
    writer = csv.writer(csvfile)
    # 写入表头
    writer.writerow(['Column1', 'Column2'])
    # 写入数据
    for elem in root:
        writer.writerow([elem.find('child1').text, elem.find('child2').text])

<!-- data.xml -->
<data>
    <record>
        <child1>Value1</child1>
        <child2>Value2</child2>
    </record>
    <record>
        <child1>Value3</child1>
        <child2>Value4</child2>
    </record>
</data>

import os

# 检查路径是否存在
if not os.path.exists('output'):
    os.makedirs('output')

# 写入CSV文件
with open('output/output.csv', 'w', newline='', encoding='utf-8') as csvfile:
    writer = csv.writer(csvfile)
    writer.writerow(['Column1', 'Column2'])
    for elem in root:
        writer.writerow([elem.find('child1').text, elem.find('child2').text])

try:
    tree = ET.parse('data.xml')
    root = tree.getroot()
except ET.ParseError as e:
    print(f"XML解析错误: {e}")

writer = csv.writer(csvfile, delimiter=',')