InnerException: Add failed. Duplicate key value supplied.
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.CoreScheduler.AddToScheduleInProgress(ScheduleHistoryItem objScheduleHistoryItem) in C:\DotNetNuke\Providers\SchedulingProviders\DNNScheduler\Scheduler.vb:line 310 at DotNetNuke.Services.Scheduling.DNNScheduling.CoreScheduler.WorkStarted(SchedulerClient& objSchedulerClient) in C:\DotNetNuke\Providers\SchedulingProviders\DNNScheduler\Scheduler.vb:line 558

This just started happening, not too long ago.  I've been ignoring it since it hasn't stopped the show, but I would like to solve the problem.  Where do I begin to troubleshoot this error?  I looked at the scheduler.vb code, but didn't seem to get anywhere with that.

Thanks!

Are you using 3.1.1? I think it fixed this issue.

The problem is causing by modules submitting search entries with duplicate key's.

I finished the update to 3.1.1 yesterday morning.  A not-so-good experience, by the way.  I am glad I had backed up everything (twice actually).  I didn't restore...I got through the problems...but I was very close to giving up.

I'll see if the update corrects the problem.

This is an old thread I know but I'm frustrated with this particular error as I am unable to determine what the cause is. I have googled plenty but the subject leads to dead ends. The only scheduled tasks enabled are the core ones. The EventQueue table has no incompleted tasks. This is 1 new dnn installation with 1 portal and 1 application pool. Version 4.5.5. I would like for somone to save me from insanity and help me understand better how to troubleshoot this. What other information can help me discover the cause.

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.AddToScheduleQueue(ScheduleHistoryItem objScheduleHistoryItem)at DotNetNuke.Services.Scheduling.DNNScheduling.Scheduler.CoreScheduler.LoadQueueFromTimer()at DotNetNuke.Services.Scheduling.DNNScheduling.Scheduler.CoreScheduler.Start()
Source:
Server Name:

Hi,

I'm experiencing the same problem.  Can someone give a hint??

Thanks in advance,

Marc

A similar thread with more info.

http://www.ventrian.com/Support/ProductForums/tabid/118/forumid/12/postid/22295/view/topic/Default.aspx