[madeirabhoy]

all of a sudden I get an error when I try to email or convert any book in my library. then all of a sudden it will work 5 mins later.

ERROR:Unhandled exception
TypeError:'str' object is not callable

calibre, version 6.19.0
ERROR: Unhandled exception: <b>TypeError</b>:'str' object is not callable

calibre 6.19 embedded-python: True
macOS-13.4-x86_64-i386-64bit Darwin ('64bit', '')
('Darwin', '22.5.0', 'Darwin Kernel Version 22.5.0: Mon Apr 24 20:51:50 PDT 2023; root:xnu-8796.121.2~5/RELEASE_X86_64')
Python 3.10.1
OSX: ('13.4', ('', '', ''), 'x86_64')
Interface language: None
Successfully initialized third party plugins: Find Duplicates (1, 10, 8) && Modify ePub (1, 8, 1) && Quality Check (1, 13, 4)
Traceback (most recent call last):
File "calibre/gui2/device.py", line 1363, in dispatch_sync_event
File "calibre/gui2/email.py", line 497, in send_by_mail
File "calibre/gui2/actions/convert.py", line 109, in auto_convert_mail
File "calibre/gui2/tools.py", line 44, in convert_single_ebook
File "calibre/gui2/convert/single.py", line 80, in __init__
File "calibre/gui2/convert/single.py", line 209, in setup_pipeline
File "calibre/gui2/convert/single.py", line 206, in widget_factory
File "calibre/gui2/convert/metadata.py", line 63, in __init__
File "calibre/gui2/convert/metadata.py", line 120, in initialize_metadata_options
File "calibre/gui2/convert/metadata.py", line 123, in series_changed
TypeError: 'str' object is not callable