How can I tell what scheduled process is causing this? I get many of these each day, and they usually happen in pairs with the exact same time stamp and often within seconds of the app restarting.

AssemblyVersion: -1
PortalID: -1
PortalName:
UserID: -1
UserName:
ActiveTabID: -1
ActiveTabName:
RawURL:
AbsoluteURL:
AbsoluteURLReferrer:
UserAgent:
DefaultDataProvider:
ExceptionGUID:
InnerException: Add failed. Duplicate key value supplied.
FileName:
FileLineNumber: -1
FileColumnNumber: -1
Method:
StackTrace:
Message: System.ArgumentException: Add failed. Duplicate key value supplied. at Microsoft.VisualBasic.Collection.Add(Object Item, String Key, Object Before, Object After) at DotNetNuke.Services.Scheduling.DNNScheduling.Scheduler.CoreScheduler.AddToScheduleInProgress(ScheduleHistoryItem objScheduleHistoryItem) at DotNetNuke.Services.Scheduling.DNNScheduling.Scheduler.CoreScheduler.WorkStarted(SchedulerClient& objSchedulerClient)
Source:
Server Name: WIC020U

We are having a discussion on an issue simular to this in the benefactors forum.

This may be becuase you have more than one application process using the same DNN Instance.

It can happen if you point more than one IIS Website (or virtual folder ) at the same physical DNN folder.
It can also happen if you are running DNN in a Web Garden.

Hi Jeff,

You could just ask them to make sure that there is only one web application configured to point to one physical folder.

The should also know what a web garden is, but you can point them at the link i put in earlier to clarify.