I have configured feeds for one of the site being managed. Though the feeds are configured, it is not updating the feeds at least daily. I confirmed that the schedulers are enabled for it and while checking the event viewer, I'm seeing the following error message.

---
AssemblyVersion:7.3.3
PortalID:-1
PortalName:
UserID:-1
UserName:
ActiveTabID:-1
ActiveTabName:
RawURL:
AbsoluteURL:
AbsoluteURLReferrer:
UserAgent:
DefaultDataProvider:DotNetNuke.Data.SqlDataProvider, DotNetNuke
ExceptionGUID:92453635-7b8d-4b77-bb39-065e0b4b0dd1
InnerException:Sequence contains more than one matching element
FileName:
FileLineNumber:0
FileColumnNumber:0
Method:System.Linq.Enumerable.Single
StackTrace:
Message:
System.InvalidOperationException: Sequence contains more than one matching element
at System.Linq.Enumerable.Single[TSource](IEnumerable`1 source, Func`2 predicate)
at DotNetNuke.Services.Scheduling.Scheduler.CoreScheduler.GetServer(String executingServer)
at DotNetNuke.Services.Scheduling.Scheduler.CoreScheduler.LoadQueueFromTimer()
at DotNetNuke.Services.Scheduling.Scheduler.CoreScheduler.Start()
Source:
---

Can't figure out what is causing problems here. When I refresh the feed manually, then everything will work fine. However, it is not updating automatically.

The log is not showing any more details.