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calendar ยท console.warn

calendar: a row's "{startProperty}" is empty...

Printed by calendar, prefixed [lattice], since 1.83.0.

Warnings reference › calendar:unparsable-start

Identifier
calendar:unparsable-start
Raised by
calendar
Since
1.83.0

What happened

A row's start field (startProperty) could not be read as a date - it was empty, or not one of the accepted shapes (a Date, an ISO string, or a 'YYYY-MM-DD HH:mm' local string). The row is skipped and counted in the calendar's unscheduled list rather than thrown.

The fix

Give the row a readable start, or read the unscheduled rows back via the calendar's unscheduled property to reconcile them.

The smallest fix

calendar.unscheduled.forEach((row) => reconcile(row));

Reference

Covered in full at the API reference.