[Bug 1846423]

[Bugzilla-m]

I experience the same with TB 68.10.0 (64-bit) on Linux Mint 20 Cinnamon (64-bit).
Five local calendars are going crazy by reminding me of undeletable reminders, many appointments are lost or cathegories altered & the like.
In the exported *.ics-file I find exactly the same X-LIC-ERROR.

Is there any workaround?
It is in fact impossible to deal with the load of undeletable reminders that count into the dozens meanwhile.

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https://bugs.launchpad.net/bugs/1846423

Title:
  Lightning: Cannot dismiss reminders. Got a VALUE parameter with an
  illegal type for property: VALUE=DURATION

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