[DNSB]

Originally Posted by MoonReader

Suddenly 64 bit Calibre stopped working for me. When I try launching, nothing happens. No Calibre entry appears in Task Manager. I uninstalled and reinstalled 6.11 (64 bit) and rebooted several times. Nothing has worked. Below is my debug screen. Any help would be greatly appreciated. Thank you.

Spoiler:

Microsoft Windows [Version 10.0.22621.1105]
(c) Microsoft Corporation. All rights reserved.


calibre 6.11 embedded-python: True
Windows-10-10.0.22621-SP0 Windows ('64bit', 'WindowsPE')
('Windows', '10', '10.0.22621')
Python 3.10.1
Windows: ('10', '10.0.22621', 'SP0', 'Multiprocessor Free')
Interface language: None
Successfully initialized third party plugins: DeDRM (10, 0, 3) && Modify ePub (1, 8, 1)
QPA platform: windows
devicePixelRatio: 1.25
logicalDpi: 96.0 x 96.0
physicalDpi: 126.26019417475726 x 126.85317919075145
ApplicationPaletteChange event ignored
Using calibre Qt style: True
ApplicationPaletteChange event received
Traceback (most recent call last):
File "calibre\utils\ipc\launch.py", line 18, in <module>
FileNotFoundError: [Errno 2] No such file or directory: 'nul'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "runpy.py", line 196, in _run_module_as_main
File "runpy.py", line 86, in _run_code
File "site.py", line 83, in <module>
File "site.py", line 78, in main
File "site.py", line 50, in run_entry_point
File "calibre\debug.py", line 230, in main
File "calibre\gui_launch.py", line 73, in calibre
File "calibre\gui2\main.py", line 553, in main
File "calibre\gui2\main.py", line 565, in run_main
File "calibre\gui2\main.py", line 403, in run_gui
File "calibre\gui2\main.py", line 413, in run_gui_
File "<frozen importlib._bootstrap>", line 1027, in _find_and_load
File "<frozen importlib._bootstrap>", line 1006, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 688, in _load_unlocked
File "bypy-importer.py", line 279, in exec_module
File "calibre\gui2\ui.py", line 46, in <module>
File "<frozen importlib._bootstrap>", line 1027, in _find_and_load
File "<frozen importlib._bootstrap>", line 1006, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 688, in _load_unlocked
File "bypy-importer.py", line 279, in exec_module
File "calibre\gui2\jobs.py", line 22, in <module>
File "<frozen importlib._bootstrap>", line 1027, in _find_and_load
File "<frozen importlib._bootstrap>", line 1006, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 688, in _load_unlocked
File "bypy-importer.py", line 279, in exec_module
File "calibre\utils\ipc\server.py", line 23, in <module>
File "<frozen importlib._bootstrap>", line 1027, in _find_and_load
File "<frozen importlib._bootstrap>", line 1006, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 688, in _load_unlocked
File "bypy-importer.py", line 279, in exec_module
File "calibre\utils\ipc\launch.py", line 20, in <module>
RuntimeError: NUL file missing in windows. This indicates a corrupted windows. You should contact Microsoft for assistance and/or follow the steps described here: https://bytes.com/topic/net/answers/...device-missing

Did you try the suggestion in the thread in this forum called Calibre not launching. NUL file missing in windows or the oldest thread I could find when I did a forum search on "NUL file missing in windows" (the quotes are needed) which is Calibre Won't Run from Jan.,2012. The advice given at Nuls R Us was intended for Windows XP and does not work on later Windows versions.

You could even use a Google search for "NUL file missing in windows" site:mobileread.com to get even more search results from multiple MobileRead forums.