ERROR Error: The event you are trying to add using DayPilot.Scheduler.events.add() is already loaded. A unique ID is required How to fix it ? thank you...
Unfortunately, I'm not able to reproduce the problem using the sample project.
Please note that duplicate IDs are not allowed. Every event that you add to the Scheduler needs to have a unique ID ("id" property of the data object - https://api.daypilot.org/daypilot-event-data/).