Occasionally when I try to save epub files to disk, i receive an error

[Catherine A Schwartz]

This is the error received:

calibre, version 2.79.1
ERROR: Error while saving: Failed to save any books to disk, click "Show details" for more information

Failed to save the EPUB format of: Skating on Thin Ice by Jessica Fletcher to disk, with error:
    Traceback (most recent call last):
      File "site-packages\calibre\gui2\save.py", line 263, in write_book
      File "site-packages\calibre\gui2\save.py", line 284, in write_fmt
      File "site-packages\calibre\startup.py", line 116, in local_open
    IOError: [Errno 22] invalid mode ('w+bN') or filename: u'K:\\Books\\D\\Donald Bain\\Murder, She Wrote\\Skating on Thin Ice - Jessica Fletcher.epub'

It seems to happen more often when it's a file I have converted or changed the metadata for, but it is not consistent. It usually saves if I cancel out of the error message and try again, without changing any settings
Running on Windows 10.

[Kovid Goyal (kovid)]

As far as I can see there is nothing invalid in either the filename or
mode of the file being opened. Which means that the problem is likely
caused by something on drive K: is it a special drive of some kind? An
external one or a network share or using a special filesystem, etc?

Try doing your save to another drive and see if the error still happens.

[Kovid Goyal (kovid)]

no followup