New calandar entries create an AirSync error

Calendar
1

I recently update eM-Client to V 10.3.1738 to take advantage of the calendar feature being available on the mobile version. When I try to create a new calendar item on my laptop, Windows V11 and up-to-date, I get the following error:

eM Client 10.3.1738+984d31d6f6 (Windows)
15:26:41 Simon AirSync Uploading item(s) to folder ‘/Conversation History’
15:26:41 Simon [AirSync] MailClient.Storage.Application.ItemOperationException: Error in client/server conversion.
AccountId = d66c6e99-7a97-4198-b138-7f95a6594fb9
AccountName = Simon
Item.Type = MailClient.Storage.Application.Event.EventItem
UniqueItemId = c714a9cf-a47d-4171-a525-d2663bbd71e9
GUIStatus_Exception_Reported = True

And the item does not sync with my phone version.

Any ideas?

And while we are at it, what is AirSync? I cannot find anything online with an understandable description.

Many thanks,

Simon

2

Calendar item created on my phone do not create an error and neither are reflected on Microsoft Outlook app on my laptop.

3

I am now getting this error for all Calendar items I have added since I updated every time I sync.

[AirSync] Error in client/server conversion.