[Error 267]

I searched but only saw one other thread involving this error message. I have restarted my PC (twice), reinstalled Calibre (also twice), and tried running it w/o any other programs (although none of said programs have anything to do with cleaning/deleting temp files as far as I am aware).

I have rec'd this error message both when attempting to move files from one library to another and when trying to alter metadata en mass.

Here is the latest version of said error message:

Traceback (most recent call last):
File "site-packages\calibre\gui2\actions\copy_to_library.py", line 111, in run
File "site-packages\calibre\gui2\actions\copy_to_library.py", line 133, in doit
File "site-packages\calibre\gui2\actions\copy_to_library.py", line 172, in _doit
File "site-packages\calibre\db\legacy.py", line 243, in import_book
File "site-packages\calibre\db\cache.py", line 1560, in add_books
File "site-packages\calibre\db\cache.py", line 57, in call_func_with_lock
File "site-packages\calibre\db\cache.py", line 1530, in create_book_entry
File "site-packages\calibre\db\cache.py", line 1252, in set_metadata
File "site-packages\calibre\db\cache.py", line 1079, in update_path
File "site-packages\calibre\db\backend.py", line 1514, in update_path
File "os.py", line 150, in makedirs
File "os.py", line 157, in makedirs
WindowsError: [Error 267] The directory name is invalid: u'E:\\Calibre Libraries\\ISBN\\Con'


What did I mess up? How do I fix it if it is fixable? (Would be awesome if it was fixable without losing all of my settings/plugin settings *again*)

Thank you in advance!