fail: Microsoft.AspNetCore.Server.Kestrel[13]
      Connection id "0HLQGSE9BRF4Q", Request id "0HLQGSE9BRF4Q:0000000A": An unhandled exception was thrown by the application.
System.ArgumentException: The given array is too small. It must be at least 2 long.
Parameter name: x
   at MathNet.Numerics.Interpolation.CubicSpline.InterpolateBoundariesSorted(Double[] x, Double[] y, SplineBoundaryCondition leftBoundaryCondition, Double leftBoundary, SplineBoundaryCondition rightBoundaryCondition, Double rightBoundary)
   at Ulysses.PriceModel.Formula.VolFit..ctor(Double[] Strikes, Double[] Volcurve, Double Fwd, Double Expiry, String method, String xType) in /src/Ulysses.PriceModel.Formula.Core/Library/VolFit.cs:line 64
   at UlyssesPriceModel.Formula.API.Models.UlyssesPricesContext.GenerateVols(String code, Int32 mmy) in /src/UlyssesPriceModel.Formula.API/Models/UlyssesPricesContext.cs:line 53
   at UlyssesPriceModel.Formula.API.Helpers.OptBaseFactory.FromSingleContract(String code, Int32 mmy, Single strike, Boolean putCall) in /src/UlyssesPriceModel.Formula.API/Helpers/OptBaseFactory.cs:line 25
   at UlyssesPriceModel.Formula.API.Controllers.PricesController.<>c__DisplayClass8_0.<<GetCustomViewItem>b__8>d.MoveNext() in /src/UlyssesPriceModel.Formula.API/Controllers/PricesController.cs:line 172
--- End of stack trace from previous location where exception was thrown ---
   at UlyssesPriceModel.Formula.API.Controllers.PricesController.GetCustomViewItem(String code, Int32 mmy, Boolean putCall, Single strike) in /src/UlyssesPriceModel.Formula.API/Controllers/PricesController.cs:line 170
   at lambda_method(Closure , Object )
   at Microsoft.Extensions.Internal.ObjectMethodExecutorAwaitable.Awaiter.GetResult()
   at Microsoft.AspNetCore.Mvc.Internal.ActionMethodExecutor.AwaitableObjectResultExecutor.Execute(IActionResultTypeMapper mapper, ObjectMethodExecutor executor, Object controller, Object[] arguments)
   at System.Threading.Tasks.ValueTask`1.get_Result()
   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.InvokeActionMethodAsync()
   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.InvokeNextActionFilterAsync()
   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Rethrow(ActionExecutedContext context)
   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.InvokeInnerFilterAsync()
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeNextResourceFilter()
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Rethrow(ResourceExecutedContext context)
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeFilterPipelineAsync()
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeAsync()
   at Microsoft.AspNetCore.Routing.EndpointMiddleware.Invoke(HttpContext httpContext)
   at Microsoft.AspNetCore.Routing.EndpointRoutingMiddleware.Invoke(HttpContext httpContext)
   at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol.ProcessRequests[TContext](IHttpApplication`1 application)