[MacOS] Failed to launch worker processes

[tetrault]

macos 10.13.6 High Sierra I have no antivirus software.

The inability to open any books was sudden. I made no operating system changes since my previous launch of calibre. I have installed a few applications. I haven't encountered problems since their installation. Any ideas?

Here's my error message:

Spoiler:

calibre, version 3.48.0
ERROR: Unhandled exception: <b>CriticalError</b>:Failed to launch worker process:
Traceback (most recent call last):
File "site-packages/calibre/utils/ipc/server.py", line 239, in do_launch
File "site-packages/calibre/utils/ipc/launch.py", line 227, in __call__
File "lib/python2.7/subprocess.py", line 394, in __init__
File "lib/python2.7/subprocess.py", line 1047, in _execute_child
OSError: [Errno 2] No such file or directory


calibre 3.48 embedded-python: True is64bit: True
Darwin-17.7.0-x86_64-i386-64bit Darwin ('64bit', '')
('Darwin', '17.7.0', 'Darwin Kernel Version 17.7.0: Fri Oct 30 13:34:27 PDT 2020; root:xnu-4570.71.82.8~1/RELEASE_X86_64')
Python 2.7.15
OSX: ('10.13.6', ('', '', ''), 'x86_64')
Interface language: None
Successfully initialized third party plugins: Find Duplicates (1, 6, 3)
Traceback (most recent call last):
File "site-packages/calibre/gui2/actions/view.py", line 246, in view_triggered
File "site-packages/calibre/gui2/actions/view.py", line 329, in _view_books
File "site-packages/calibre/gui2/actions/view.py", line 281, in _view_calibre_books
File "site-packages/calibre/gui2/actions/view.py", line 108, in view_format_by_id
File "site-packages/calibre/gui2/actions/view.py", line 157, in _view_file
File "site-packages/calibre/gui2/actions/view.py", line 127, in _launch_viewer
File "site-packages/calibre/gui2/jobs.py", line 287, in launch_gui_app
File "site-packages/calibre/utils/ipc/server.py", line 257, in run_job
File "site-packages/calibre/utils/ipc/server.py", line 230, in launch_worker
CriticalError: Failed to launch worker process:
Traceback (most recent call last):
File "site-packages/calibre/utils/ipc/server.py", line 239, in do_launch
File "site-packages/calibre/utils/ipc/launch.py", line 227, in __call__
File "lib/python2.7/subprocess.py", line 394, in __init__
File "lib/python2.7/subprocess.py", line 1047, in _execute_child
OSError: [Errno 2] No such file or directory

[kovidgoyal]

That indicates teh calibre installation is damaged, try re-installing.