Very odd.
For now, just manually modify file Job Spy.json for that setting, which is:
Code:
prefs['GUI_TOOLS_ACTIVATE_TWEAK_SAVE_COVER_SEPARATELY_BY_LIBRARY'] = unicode("False")
You could also
temporarily add 'job_spy_save_cover_separately' = {} to tweaks, which is what the message is about. It will not do anything except turn off the warning message until the Activation in JS Customizing is turned-off. Afterwards, delete the 'job_spy_save_cover_separately' = {}, and restart.
Added:
Timing is everything.
The Tweak in Preferences and the Activation in JS Customizing are connected and validated at Calibre Startup.
The error message appears if you delete the Tweak from Preferences and then restart while the Activation in JS Customizing is "turned on".
To Activate a Tweak: Add the Tweak in Preferences, save, then restart. Then, Activate in JS Customizing. Save. Restart.
To Deactivate a Tweak: Deactivate it in JS Customizing. Save. Restart. Delete the Tweak in Preferences. Save. Restart.
DaltonST