Getting ErrorRecurrenceHasNoOccurrence when reading calendar events

[tinyweasel]

I'm using pyexchange to read calendar events and save them to a web application, but I get this error on occasion when running the sync code, and I'm trying to figure out exactly what triggers it, and if it's going to stop events being synced to the web app, and how to handle it. Any ideas what particular situation triggers it?

[tinyweasel]

The events aren't recurring events, at least the ones I've checked aren't so far.

[tinyweasel]

Still happening...