[Bug 1846423]

[Cohaller]

Firefox 68.5.0
Lightning 68.1.2

I just got the same error.

Because of another issue with lightning, I decided to export all
calender events. When I opened the ICS file, I noticed that almost all
event entries have the above mentioned error.

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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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