I just purchased One Calendar Premium, and it syncs fine across my devices, but I can only access the premium features on one device.  If I try to do something like even change a color, it says I need to purchase the premium.  I thought it worked across devices. 

OneCalendar on Samsung gives the following message; Synchronisation completed with 1 errors. Nullable object must have a value.

Please advise/assist

Dewald Pretorius

Ad described

I have had OneCalendar about 6 months and up until about 2 weeks ago worked seemlessly with my iCloud Calendar. Now, every time I open OneCalendar, I get "Synchronisation completed with "n" errors (where n can be anything from 1 to 8) and my calendar does not get updated. In an attempt to fix, I uninstalled / re-installed the app (which I have paid for) and now I see no calendar items and continue to get the Synchronisation errors. Help please!

Hi, I am getting the following system exception when trying to sync with my NextCloud calendar. I am not sure if this is a bug with OneCalendar or if the site really sends wrong data.

The effect could have been caused by moving (by dragging) a calendar entry to another day/time. The move went visually ok but when I opened the moved entry, it still showed the old date/time, if I remember correctly. The following sync showed the error, and this is now happening with every sync operation.

One of the Outlook365 calendars that is shared by a colleague returns this error on every synchronization call:

Constraint Action: ReceiveCalendar Calendar: Person's Name SQLite.SQLiteException: Constraint at SQLite.PreparedSqlLiteInsertCommand.ExecuteNonQuery (System.Object[] source) [0x00178] in <84b9c9e630fa45bd8ac799333976ebbf>:0 at SQLite.SQLiteConnection.Insert (System.Object obj, System.String extra, System.Type objType) [0x000ef] in <84b9c9e630fa45bd8ac799333976ebbf>:0 at SQLite.SQLiteConnection.Insert (System.Object obj) [0x00012] in <84b9c9e630fa45bd8ac799333976ebbf>:0 at XCalendarApp.SQLite.Repositories.RepositoryBase`1[T].Insert (T entity) [0x00006] in <5a6eda7644914328b00993b248c6cc0a>:0 at XCalendarApp.SQLite.Repositories.CIExpandedRepository.Insert (XCalendarApp.SQLite.Entities.CIExpandedDataEntity entity) [0x00025] in <5a6eda7644914328b00993b248c6cc0a>:0 at XCalendarApp.ProviderBase.StorageManager`8[TCachedCalendar,TProviderCalendarItem,TCachedAppointment,TProviderAppointmentItem,TCachedContacts,TCachedContact,TProviderContactItem,TAppointmentDbData].AddCIExpanded (XCalendarApp.SQLite.Transaction transaction, XCalendarApp.Model.Data.ICalendarItem calendarItem, XCalendarApp.Common.Timezones.TZDateTime tzStartDateTime, XCalendarApp.Common.Timezones.TZDateTime tzEndDateTime) [0x0008b] in <d1275c79399f4afd9057082e36313d21>:0 at XCalendarApp.ProviderBase.StorageManager`8[TCachedCalendar,TProviderCalendarItem,TCachedAppointment,TProviderAppointmentItem,TCachedContacts,TCachedContact,TProviderContactItem,TAppointmentDbData].AddCIExpanded (XCalendarApp.SQLite.Transaction transaction, XCalendarApp.Model.Data.IAppointment appointment) [0x0000f] in <d1275c79399f4afd9057082e36313d21>:0 at XCalendarApp.ProviderBase.AccountProviderBase`9[TCachedCalendar,TProviderCalendarItem,TCachedAppointment,TProviderAppointmentItem,TCachedContacts,TCachedContact,TProviderContactItem,TAppointmentDbData,TAccountOptions].UpdateExpandedDataForAppointment (XCalendarApp.SQLite.Transaction trans, TCachedAppointment appointment) [0x0009b] in <d1275c79399f4afd9057082e36313d21>:0 at XCalendarApp.ProviderBase.AccountProviderBase`9[TCachedCalendar,TProviderCalendarItem,TCachedAppointment,TProviderAppointmentItem,TCachedContacts,TCachedContact,TProviderContactItem,TAppointmentDbData,TAccountOptions].UpdateAppointmentAndExpanded (XCalendarApp.SQLite.Transaction trans,

For some months now, the "Repeat" option for events has not been working properly. It lets me create events that repeat in the time that I select but the problem comes when I want to edit them, if I want to delete an event of the series, it lets me delete one but when I delete another one the first one reappears. It does not work well, the same happens if I edit them, if I change the description of an event included in a series when I save it, it returns to the way it was initially. HELP

Very nice app, but following bug:

- Full-day events are always transmitted with +0h Greenwich time from iPad, +1h Stand EUE time needed -> error: whole day event s are transferred into normal  time dates in other apps/ phone

- iPad One-calendar connection to apple cal in iPad, time zones all correct

- Problem only appears in one calendar, not in apple calendar

Not all events in my google calendar sync on One Calendar ,  I have to look at both calendars to see events ??  Miss appointments:(:( seems google calendar current vs OneCalendar that I upgraded ???? oneCalendar, google, exchange, 

I get the following problem when syncing " sequence contains no elements .  I am syncing with zoho personal CALDAV calendar.  Zoho calendar works with apple calendar on same iphone?? 

Have recently 'lost' 2 of my 3 calendars from Android version of 1Cal. I connect with iCloud Calendar which still shows all 3 calendars.

Error code:  Response status  code does not indicate success: 500 (Internal Server Error).:<?xmi version ="1.0" encoding ="UTF-8" standalone = "yes"?><multistatus xmlns ="DAV":">

I have tried uninstalling and re-installing but problem persists.

CAN YOU HELP?

I Really don't want to stop using 1Cal its brilliant!!

Iain Kellock

Hi Team,

Since a couple of weeks i got a sync issue with an outlook calendar. All items (as far as i can see) do sync however after a while a sync / constraint error is reported (see attachment).

Reinstalling the app does not solve the issue, also no issues appear with other mailboxes.

Any idea what is causing it or more importantly how i can resolve it. Thanks in advance for your support!

Kind Regards,

Martijn

OneCalendar (iOS): Old data (contact birthday) remained in OneCalendar when actual contact was removed. Calendar sync was with Google Calendar. On browser, Google Calendar did not show the birthday after the contact was remove, but the info still remained in OneCalendar (iPhone). The only way to remove was to remove the Google calendar account, then add back to resync all data. I'm wondering if this could be a local iOS cache data issue? 

trying to get the premium version for Windows 11 one Calendar failed because missing licence. What can I do. There is also no posibility to get a licence. Please advise.

Repair keeps coming up anytime I try to open the app an use it

Why does Yahoo one time passwords no longer work? :'(

Dear support team,

I have your calendar installed on my Android smartphone and on my Windows laptop. It worked really well so far, but since this week I am getting an error (see attached screenshot) that the calendar is unable to synchronize my appointments. I don't know what to do and how to get this working again, because the error message isn't informative. Do you have an idea, what the problem could be?

Thanks in advance! Stefan Hackel

Hello OneCalendar Team,

we currently have an issue when synchronizing our calendar with M365. We get a too many requests error 429 from one calendar. We can just dismiss this error and the calendar keeps working fine, but it is showing again and again. We tried to fix this issue by removing all calendar entries from the past year so there are not too many synchronized. This unfortunately did not help. Is there any solution to this issue?