[FredenDon]

Hi I just updated calibre to version 5.7.0
trying to start calibre after installing I get following error
Have removed and installed several times but every time I
get the same error

ERROR: Boot Error: There was an error starting calibre parts of caliber may not function. Click "Show details" for more information.

Traceback (most recent call last):
File "calibre\gui2\main.py", line 300, in initialize_db_stage2
File "calibre\gui2\main.py", line 244, in start_gui
File "calibre\gui2\ui.py", line 203, in initialize
File "calibre\srv\library_broker.py", line 201, in __init__
File "calibre\srv\library_broker.py", line 259, in gui_library_changed
File "calibre\srv\library_broker.py", line 73, in correct_case_of_last_path_component
IndexError: tuple index out of range

How can I fix this? thanks Fred