Hi, Good day,
I have the same problem.
But I am using Event module 5.02.02.
I have also tried the workaround solution. And It worked, it prevented the error to show.
The only problem is that, those who are subscribed to event module will not be notified.

Do you any other solution for this?

Hi Roger,
First of, I want to say thank you for your response.
Currently I am using DotNetNuke 05.03.01 Community Edition.

The event is save though. Since I can see the newly added event in the calendar view.

This is the error message:

ModuleId: 551
ModuleDefId: 135
FriendlyName:
ModuleControlSource: DesktopModules/Events/EditEvents.ascx
AssemblyVersion: 5.3.1
PortalID: 0
PortalName: (sorry i think i cannot disclose the portal name)
UserID: 1
UserName: host
ActiveTabID: 113
ActiveTabName: Master Calendar
RawURL: /ConferencesEvents/MasterCalendar/tabid/113/ctl/Edit/mid/551/Default.aspx
AbsoluteURL: /Default.aspx
AbsoluteURLReferrer: http://www.socap.org/ConferencesEvents/MasterCalendar/tabid/113/ctl/Edit/mid/551/Default.aspx
UserAgent: Mozilla/5.0 (Windows NT 5.1; rv:10.0.2) Gecko/20100101 Firefox/10.0.2
DefaultDataProvider: DotNetNuke.Data.SqlDataProvider, DotNetNuke.SqlDataProvider
ExceptionGUID: 57bd90f5-a068-4624-983a-65ae0152d05f
InnerException: String reference not set to an instance of a String. Parameter name: name
FileName:
FileLineNumber: 0
FileColumnNumber: 0
Method: System.Globalization.CultureInfo..ctor
StackTrace:
Message: DotNetNuke.Services.Exceptions.ModuleLoadException: String reference not set to an instance of a String. Parameter name: name ---> System.ArgumentNullException: String reference not set to an instance of a String. Parameter name: nameat System.Globalization.CultureInfo..ctor(String name, Boolean useUserOverride)at DotNetNuke.Modules.Events.EventBase.SendNewEventEmails(EventInfo objEvent)at DotNetNuke.Modules.Events.EditEvents.UpdateProcessing(Int32 ProcessItem) in C:\inetpub\wwwroot\DesktopModules\Events\EditEvents.ascx.vb:line 1581at DotNetNuke.Modules.Events.EditEvents.updateButton_Click(Object sender, EventArgs e) in C:\inetpub\wwwroot\DesktopModules\Events\EditEvents.ascx.vb:line 963--- End of inner exception stack trace ---
Source:
Server Name: 209593-1

Ok. I'll take this advice for consideration.

Just want to ask if will it affect the current data of Events in my database if I upgrade the Event module from 5.2.2 to the latest version which is the 5.2.3?