Qnap Sequence contains more than one element

Sonarr Ver. 2.0.0.4753
Mono version 4.8.1
OS: QTS 4.3.3.0229 on a QNAP TS-451A
((Debug logs)):
Request Failed. GET /api/config/naming: Sequence contains more than one element

System.InvalidOperationException: Sequence contains more than one element
at System.Linq.Enumerable.SingleOrDefault[TSource] (System.Collections.Generic.IEnumerable1[T] source) [0x000a3] in <198d428ffe33413aa3c4cb6d388f57b3>:0 at NzbDrone.Core.Datastore.BasicRepository1[TModel].SingleOrDefault () [0x00006] in :0
at NzbDrone.Core.Organizer.NamingConfigService.GetConfig () [0x00000] in :0
at NzbDrone.Api.Config.NamingConfigModule.GetNamingConfig () [0x00000] in :0
at NzbDrone.Api.REST.RestModule1[TResource].<set_GetResourceSingle>b__38_0 (System.Object options) [0x00006] in <fde2ea3b2b724ca6bc6d23d226f6133e>:0 at (wrapper dynamic-method) System.Object:CallSite.Target (System.Runtime.CompilerServices.Closure,System.Runtime.CompilerServices.CallSite,System.Func2<object, object>,object)
at Nancy.Routing.Route+<>c__DisplayClass4.b__3 (System.Object parameters, System.Threading.CancellationToken context) [0x00049] in <63c44d6f8d7e4f339a987bf9eb94d931>:0

(Make sure debug logging is enabled in settings and post the full log to hastebin/pastebin/dropbox/google drive or something similar, do not post them directly here)

Description of issue:
I just installed Sonarr on a brand new Qnap nas, and the program hangs in the settings tab. The four dots just go left and right forever. It happened after first install. Tried reinstalling several times.

Looks like a extra record was added to the database, running the housekeeping task on System: Tasks should clear that up.

thanks. that did it.

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