startup error affecting find duplicates action

[Garth Newton]

On starting Calibre v5.15.0 on Windows 10 Calibre reports a startup error this way:

calibre, version 5.15.0
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\gui2\ui.py", line 391, in initialize
  File "calibre_plugins.find_duplicates.action", line 54, in initialization_complete
  File "calibre_plugins.find_duplicates.duplicates", line 69, in __init__
  File "calibre_plugins.find_duplicates.config", line 111, in get_exemption_lists
NameError: name 'xrange' is not defined

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "calibre\gui2\main.py", line 313, in initialize_db_stage2
  File "calibre\gui2\main.py", line 257, in start_gui
  File "calibre\gui2\ui.py", line 395, in initialize
AttributeError: 'FindDuplicatesAction' object has no attribute 'installation_type'

The debug report shows similar information:

calibre Debug log
calibre 5.15 embedded-python: True is64bit: False
Windows-10-10.0.19041 Windows ('32bit', 'WindowsPE')
32bit process running on 64bit windows
('Windows', '10', '10.0.19041')
Python 3.8.5
Windows: ('10', '10.0.19041', '', 'Multiprocessor Free')
Interface language: None
Successfully initialized third party plugins: Find Duplicates (1, 6, 3)
calibre 5.15 embedded-python: True is64bit: False
Windows-10-10.0.19041 Windows ('32bit', 'WindowsPE')
32bit process running on 64bit windows
('Windows', '10', '10.0.19041')
Python 3.8.5
Windows: ('10', '10.0.19041', '', 'Multiprocessor Free')
Interface language: None
Successfully initialized third party plugins: Find Duplicates (1, 6, 3)
Turning on automatic hidpi scaling
devicePixelRatio: 1.0
logicalDpi: 96.0 x 96.0
physicalDpi: 92.53889943074003 x 92.67567567567568
Using calibre Qt style: True
[0.00] Starting up...
[0.00] Showing splash screen...
[0.56] splash screen shown
[0.56] Initializing db...
[1.03] db initialized
[1.03] Constructing main UI...
[2.08] main UI initialized...
[2.08] Hiding splash screen
[2.42] splash screen hidden
Traceback (most recent call last):
  File "calibre\gui2\ui.py", line 391, in initialize
  File "calibre_plugins.find_duplicates.action", line 54, in initialization_complete
  File "calibre_plugins.find_duplicates.duplicates", line 69, in __init__
  File "calibre_plugins.find_duplicates.config", line 111, in get_exemption_lists
NameError: name 'xrange' is not defined
Traceback (most recent call last):
  File "calibre\gui2\ui.py", line 1203, in closeEvent
  File "calibre\gui2\ui.py", line 1130, in shutdown
AttributeError: 'Main' object has no attribute 'listener'

When running Calibre crashes when the Find Duplicates button is clicked.

[Kovid Goyal (kovid)]

Fixed in branch master. The fix will be in the next release. calibre is usually released every alternate Friday.

 status fixreleased

[Kovid Goyal (kovid)]

Just update the Find Duplicates plugin or uninstall it from
Preferences->Plugins and you will be fine.

[Garth Newton (bobby-newmark)]

Thank you!