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我正在尝试使用ebaysdk模块访问Ebay API。我使用文档中给出的示例代码，并在易趣开发者站点上注册以生成所需的应用程序ID。下面是我的程序的源代码：使用Ebay API时出错
ebaay.py
from ebaysdk.finding import Connection as Finding
api = Finding(appid="123456789")
response = api.execute('findItemsAdvanced', {'keywords': 'Python'})
print(response.dict())
YAML文件（假设我的应用程序ID为123456789）
# eBay SDK Defaults
name: ebay_api_config
# Trading API Sandbox - https://www.x.com/developers/ebay/products/trading-api
api.sandbox.ebay.com:
compatability: 719
appid: 123456789
certid: ENTER_YOUR_CERTID_HERE
devid: ENTER_YOUR_DEVID_HERE
token: ENTER_YOUR_TOKEN_HERE
# Trading API - https://www.x.com/developers/ebay/products/trading-api
api.ebay.com:
version: 719
appid: 123456789
certid: ENTER_YOUR_CERTID_HERE
devid: ENTER_YOUR_DEVID_HERE
token: ENTER_YOUR_TOKEN_HERE
# Finding API - https://www.x.com/developers/ebay/products/finding-api
svcs.ebay.com:
appid: 123456789
version: 1.0.0
# Shopping API - https://www.x.com/developers/ebay/products/shopping-api
open.api.ebay.com:
appid: 123456789
version: 671
# Optional affiliate tracking
# http://developer.ebay.com/DevZone/shopping/docs/Concepts/ShoppingAPI_FormatOverview.html#StandardURLParameters
trackingid: ENTER_YOUR_TRACKINGID_HERE
trackingpartnercode: ENTER_YOUR_PARTNERCODE_HERE
然而，当我尝试运行我的Python脚本，我遇到以下错误：
Traceback (most recent call last):
File "E:/Python27/Web Scraping/ebaay.py", line 3, in <module>
api = Finding(appid="123456789")
File "C:\Python27\lib\site-packages\ebaysdk\finding\__init__.py", line 70, in __init__
config_file=kwargs.get('config_file', 'ebay.yaml'))
File "C:\Python27\lib\site-packages\ebaysdk\config.py", line 39, in __init__
self._populate_yaml_defaults()
File "C:\Python27\lib\site-packages\ebaysdk\config.py", line 50, in _populate_yaml_defaults
for k, val in dataobj.get(self.domain, {}).items():
AttributeError: 'NoneType' object has no attribute 'items'
我的代码似乎有什么问题？