calibre does not start after update 7.4

[Rinekeh]

Hello,

I could use some help. I tried to update Calibre to version 7.4 but I can see that nothing happened in the calibre folder.
Since then I cannot start Calibre. It just won't open.

What can I do now? I sent in my previous post the debug result (can be found under 'introduction'. No idea how to repoduce this. I found the instruction somewhere, but don't remember where.

Should I delete the programme and install again? I already tried repairing the installation.

I am a happy user of Calibre and not a complete nitwit to installing etc, but I usually avoid using forums, because I easily lose my way....

So please help me. Maybe I am not the only one with this problem?

Kind regards, Rineke

[Sirtel]

I copied the log from the Introduction forum:

program name = 'C:\Program Files\Calibre2\calibre-debug.exe'
isolated = 1
environment = 0
user site = 0
safe_path = 1
import site = 1
is in build tree = 0
stdlib dir = ''
sys._base_executable = 'C:\\Program Files\\Calibre2\\calibre-debug.exe'
sys.base_prefix = 'C:\\Users\\rinek'
sys.base_exec_prefix = 'C:\\Users\\rinek'
sys.platlibdir = 'DLLs'
sys.executable = 'C:\\Program Files\\Calibre2\\calibre-debug.exe'
sys.prefix = 'C:\\Users\\rinek'
sys.exec_prefix = 'C:\\Users\\rinek'
sys.path = [
]
Fatal Python error: init_fs_encoding: failed to get the Python codec of the filesystem encoding
Python runtime state: core initialized
Traceback (most recent call last):
File "<frozen importlib._bootstrap>", line 1176, in _find_and_load
File "<frozen importlib._bootstrap>", line 1147, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 690, in _load_unlocked
File "bypy-importer.py", line 275, in exec_module
File "bypy-importer.py", line 63, in get_module_code
ValueError: bad marshal data (unknown type code)

Extension modules: bypy_frozen_importer (total: 1)

C:\Users\rinek>

[kovidgoyal]

Uninstall, delete C:\\Program Files\\Calibre2
(or wherever you chose to install calibre). Then re-install. And
dont worry, uninstalling will not affect your books/settings.