I am receiving the followiing error message: "Event Viewer is currently unavailable" intermittently on a production web site. I have tried deleting the Events module and adding it again, and still get the same behavior. Here are my specifics:

Events module version: 03.03.08

Admin event viewer log entry:

ModuleId: 1689
ModuleDefId: 96
FriendlyName: VIA Events
ModuleControlSource: DesktopModules/Events/Events.ascx
AssemblyVersion: 04.06.02
PortalID: 6
PortalName: Responsible Livelihood
UserID: 72
UserName: superman
ActiveTabID: 481
ActiveTabName: Events
RawURL: /IntheCommunity/Events/tabid/481/Default.aspx
AbsoluteURL: /Default.aspx
AbsoluteURLReferrer: http://via/IntheCommunity/Events/tabid/481/Default.aspx
UserAgent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 1.1.4322; .NET CLR 2.0.50727; InfoPath.1; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022)
DefaultDataProvider: DotNetNuke.Data.SqlDataProvider, DotNetNuke.SqlDataProvider
ExceptionGUID: cb86c743-ec82-4cb3-85f2-861b32da284b
InnerException: Object reference not set to an instance of an object.
FileName:
FileLineNumber: 0
FileColumnNumber: 0
Method: DotNetNuke.Modules.Events.SelectCategory.get_SelectedCategory
StackTrace:
Message: DotNetNuke.Services.Exceptions.ModuleLoadException: Object reference not set to an instance of an object. ---> System.NullReferenceException: Object reference not set to an instance of an object.at DotNetNuke.Modules.Events.SelectCategory.get_SelectedCategory()at DotNetNuke.Modules.Events.EventList.BindDataGrid()at DotNetNuke.Modules.Events.EventList.Page_Load(Object sender, EventArgs e)--- End of inner exception stack trace ---
Source:
Server Name: WWCODCWEB02

As a workaround, you can try to disable categories in the module settings.