API Lookup endpoint not working

Sonarr version 3.0.3.610
On Windows
After an update this morning the API Lookup endpoint returns the following error every time.

19-9-1 10:26:34.6|Fatal|SonarrErrorPipeline|Request Failed. GET /api/series/lookup

[v3.0.3.619] Nancy.ViewEngines.ViewNotFoundException:
Unable to locate requested view

• Name: d__3
• Root path: C:\ProgramData\Sonarr\bin
• Supported extensions:

  • sshtml
  • html
  • htm
    • Inspected locations:
  • views/api/series/lookup/SeriesLookup/d__3-en-US
  • views/api/series/lookup/SeriesLookup/d__3
  • api/series/lookup/SeriesLookup/d__3-en-US
  • api/series/lookup/SeriesLookup/d__3
  • views/api/series/lookup/d__3-en-US
  • views/api/series/lookup/d__3
  • api/series/lookup/d__3-en-US
  • api/series/lookup/d__3
  • views/SeriesLookup/d__3-en-US
  • views/SeriesLookup/d__3
  • SeriesLookup/d__3-en-US
  • SeriesLookup/d__3
  • views/d__3-en-US
  • views/d__3
  • d__3-en-US
  • d__3

If you were expecting raw data back, make sure you set the ‘Accept’-header of the request to correct format, for example ‘application/json’

at Nancy.ViewEngines.DefaultViewFactory.GetRenderedView(String viewName, Object model, ViewLocationContext viewLocationContext)
at Nancy.ViewEngines.DefaultViewFactory.RenderView(String viewName, Object model, ViewLocationContext viewLocationContext)
at Nancy.Responses.Negotiation.ViewProcessor.Process(MediaRange requestedMediaRange, Object model, NancyContext context)
at System.Dynamic.UpdateDelegates.UpdateAndExecute4[T0,T1,T2,T3,TRet](CallSite site, T0 arg0, T1 arg1, T2 arg2, T3 arg3)
at CallSite.Target(Closure , CallSite , IResponseProcessor , String , Object , NancyContext )
at Nancy.Responses.Negotiation.DefaultResponseNegotiator.NegotiateResponse(IEnumerable1 compatibleHeaders, NegotiationContext negotiationContext, NancyContext context) at Nancy.Responses.Negotiation.DefaultResponseNegotiator.CreateResponse(IList1 compatibleHeaders, NegotiationContext negotiationContext, NancyContext context)
at Nancy.Responses.Negotiation.DefaultResponseNegotiator.NegotiateResponse(Object routeResult, NancyContext context)
at Nancy.Routing.DefaultRouteInvoker.d__2.MoveNext()
— End of stack trace from previous location where exception was thrown —
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Nancy.Routing.DefaultRequestDispatcher.d__5.MoveNext()
— End of stack trace from previous location where exception was thrown —
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Nancy.NancyEngine.d__22.MoveNext()

19-9-1 10:26:34.6|Debug|Api|[GET] /api/series/lookup?term=tvdb%3A272391&apikey=(removed) 500.InternalServerError (5 ms)
19-9-1 10:26:38.2|Debug|Api|[GET] /api/v3/health: 200.OK (0 ms)
19-9-1 10:26:38.2|Debug|Api|[GET] /api/v3/system/status: 200.OK (0 ms)
19-9-1 10:26:38.8|Debug|Api|[GET] /api/v3/diskspace: 200.OK (570 ms)
19-9-1 10:26:50.1|Debug|Api|[GET] /api/v3/log/file: 200.OK (0 ms)

Got another update during the day and problem went away.

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