[quicksilver]

I'm trying to convert an HTML file to an RTF file. The conversion works when I am using Calibre GUI, but when I try to run the .exe - it fails.

What am I doing wrong?

C:\Program Files\Calibre2>ebook-convert.exe index.html something.rtf
1% Converting input to HTML...
InputFormatPlugin: HTML Input running
on C:\Program Files\Calibre2\index.html
Language not specified
Creator not specified
Building file list...
Initial parse failed:
Parsing file 'index.html' as HTML
Forcing index.html into XHTML namespace
Python function terminated unexpectedly
  _getfullpathname() argument 1 must be (buffer overflow), not str (Error Code:
1)
Traceback (most recent call last):
  File "site.py", line 103, in main
  File "site.py", line 85, in run_entry_point
  File "site-packages\calibre\ebooks\conversion\cli.py", line 249, in main
  File "site-packages\calibre\ebooks\conversion\plumber.py", line 736, in run
  File "site-packages\calibre\customize\conversion.py", line 208, in __call__
  File "site-packages\calibre\ebooks\html\input.py", line 286, in convert
  File "site-packages\calibre\ebooks\html\input.py", line 361, in create_oebbook

  File "site-packages\calibre\ebooks\oeb\base.py", line 179, in rewrite_links
  File "site-packages\calibre\ebooks\html\input.py", line 411, in resource_adder

  File "site-packages\calibre\startup.py", line 81, in my_abspath
  File "ntpath.py", line 459, in abspath
TypeError: _getfullpathname() argument 1 must be (buffer overflow), not str

Thanks.