# ActionLogs

ID: A1EB5C9F-1EB1-4CED-B82B-574BF32F5066
ModuleName: ThrowHelper
ActionName: ThrowArgumentNullException
ITCode: admin
ActionUrl: /Home/GetDeviceVariableChart
ActionTime: 2023-04-12 23:01:08.0429225
IP: ::1
Remark:
  System.ArgumentNullException: Value cannot be null. (Parameter 'source')
     at System.Linq.ThrowHelper.ThrowArgumentNullException(ExceptionArgument argument)
     at System.Linq.Enumerable.Count[TSource](IEnumerable`1 source, Func`2 predicate)
     at IoTGateway.Controllers.HomeController.GetDeviceVariableChart()
     at lambda_method5701(Closure , Object , Object[] )
     at Microsoft.AspNetCore.Mvc.Infrastructure.ActionMethodExecutor.SyncActionResultExecutor.Execute(IActionResultTypeMapper mapper, ObjectMethodExecutor executor, Object controller, Object[] arguments)
     at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<InvokeActionMethodAsync>g__Logged|12_1(ControllerActionInvoker invoker)
     at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<InvokeNextActionFilterAsync>g__Awaited|10_0(ControllerActionInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
     at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Rethrow(ActionExecutedContextSealed context)
     at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
     at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.InvokeInnerFilterAsync()
  --- End of stack trace from previous location ---
     at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeNextResourceFilter>g__Awaited|25_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
     at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Rethrow(ResourceExecutedContextSealed context)
     at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
     at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.InvokeFilterPipelineAsync()
  --- End of stack trace from previous location ---
     at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<Invo


