无法下载豆丁网资源

[QuestionMark001]

网址 https://www.docin.com/p-2300126438.html，出现以下报错：

PS D:\docDownloader> .\docDownloader.exe
请输入网址（输入exit退出）：https://www.docin.com/p-2300126438.html
Traceback (most recent call last):
  File "docDownloader.py", line 44, in <module>
  File "fire\core.py", line 141, in Fire
  File "fire\core.py", line 466, in _Fire
  File "fire\core.py", line 681, in _CallAndUpdateTrace
  File "docDownloader.py", line 29, in main
  File "douding.py", line 13, in download
ValueError: substring not found
[27544] Failed to execute script docDownloader