Upon upgrade to 19.10 Thunderbird can't access calendars

Upon upgrade to 19.10 Thunderbird can't access calendars
It says that provider can't be found
Will have to reconfigure them ?

W

p.s. Add-ons have to be updated... just figured out... Duh !

If by 'calendars' the "Lightning" add-on is meant...
Based on information from here: https://support.mozilla.org/en-US/kb/calendar-updates-issues-thunderbird#w_i-am-on-linux-and-lightning-disappeared-after-thunderbird-got-updated-release-and-beta-channel

  1. Do not install Lightning or remove it (if already installed)
  2. Close Thunderbird
  3. sudo apt install xul-ext-lightning
  4. Restart Thunderbird

Calendar will be available now.

Lightning was OK
I just had to update the Google access add-on,
i.e. the "Provider for Google Calendar"