Trouble starting Calibre on a different laptop

[mitch13]

I run Calibre Portable from a 4Tb portable drive. Have done for years. I just tried running it on a different laptop (which it has run before) and keep coming up with the message below which I cannot make any sense of.

"calibre, version 7.4.0
ERROR: Contacting calibre failed: Failed to contact running instance of calibre, try restarting calibre

Failed to connect to Listener at: \\.\pipe\CalibreGUI-mitchx with error: QLocalSocket::connectToServer: Invalid name

b'launched:["calibre.exe"]'

Any help would be appreciated. Running on an HP 2-in-1 laptop Windows 10

mitch13

[kovidgoyal]

Have you tried rebooting your laptop?

[mitch13]

Hello Kovid,
I had rebooted but did it againto be sure. Nowanother message came up:

"calibre, version 7.4.0
ERROR: Startup error: There was an error during calibre startup. Parts of calibre may not function. Click "Show details" to learn more.

Traceback (most recent call last):
File "calibre\spell\dictionary.py", line 205, in __init__
File "calibre\spell\__init__.py", line 22, in parse_lang_code
File "calibre\utils\localization.py", line 471, in canonicalize_lang
File "calibre\utils\localization.py", line 393, in _load_iso639
File "calibre\utils\serialize.py", line 107, in msgpack_loads
File "msgpack/_unpacker.pyx", line 205, in msgpack._cmsgpack.unpackb
ValueError: Unpack failed: incomplete input

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "calibre\gui2\main.py", line 312, in initialize_db_stage2
File "calibre\gui2\main.py", line 252, in start_gui
File "calibre\gui2\ui.py", line 141, in __init__
File "calibre\gui2\ui.py", line 159, in init_iaction
File "calibre\customize\__init__.py", line 662, in load_actual_plugin
File "importlib\__init__.py", line 126, in import_module
File "<frozen importlib._bootstrap>", line 1204, in _gcd_import
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 279, in exec_module
File "calibre\gui2\actions\edit_metadata.py", line 28, in <module>
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 279, in exec_module
File "calibre\gui2\dialogs\metadata_bulk.py", line 28, in <module>
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 279, in exec_module
File "calibre\gui2\dialogs\template_line_editor.py" , line 11, in <module>
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 279, in exec_module
File "calibre\gui2\dialogs\template_dialog.py", line 29, in <module>
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 279, in exec_module
File "calibre\gui2\dialogs\template_dialog_ui.py", line 433, in <module>
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 279, in exec_module
File "calibre\gui2\dialogs\template_dialog_code_widget. py", line 15, in <module>
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 279, in exec_module
File "calibre\gui2\tweak_book\__init__.py", line 124, in <module>
File "calibre\spell\dictionary.py", line 207, in __init__
File "calibre\spell\__init__.py", line 22, in parse_lang_code
File "calibre\utils\localization.py", line 471, in canonicalize_lang
File "calibre\utils\localization.py", line 393, in _load_iso639
File "calibre\utils\serialize.py", line 107, in msgpack_loads
File "msgpack/_unpacker.pyx", line 205, in msgpack._cmsgpack.unpackb
ValueError: Unpack failed: incomplete input"

What does this mean?

[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.

[mitch13]

Hi Kovid,
Many thanks for your help - seems to be going again now.

Cheers

John