Server Error in '/' Application.

Value cannot be null.
Parameter name: source

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.ArgumentNullException: Value cannot be null.
Parameter name: source

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:


[ArgumentNullException: Value cannot be null.
Parameter name: source]
   System.Linq.Enumerable.OfType(IEnumerable source) +127
   System.Data.Linq.SqlClient.QueryConverter.VisitContains(Expression sequence, Expression value) +333
   System.Data.Linq.SqlClient.QueryConverter.VisitInner(Expression node) +889
   System.Data.Linq.SqlClient.QueryConverter.VisitExpression(Expression exp) +33
   System.Data.Linq.SqlClient.QueryConverter.VisitWhere(Expression sequence, LambdaExpression predicate) +156
   System.Data.Linq.SqlClient.QueryConverter.VisitInner(Expression node) +889
   System.Data.Linq.SqlClient.QueryConverter.VisitSelect(Expression sequence, LambdaExpression selector) +38
   System.Data.Linq.SqlClient.QueryConverter.VisitInner(Expression node) +889
   System.Data.Linq.SqlClient.QueryConverter.VisitDistinct(Expression sequence) +26
   System.Data.Linq.SqlClient.QueryConverter.VisitInner(Expression node) +889
   System.Data.Linq.SqlClient.QueryConverter.ConvertOuter(Expression node) +131
   System.Data.Linq.SqlClient.SqlProvider.BuildQuery(Expression query, SqlNodeAnnotations annotations) +166
   System.Data.Linq.SqlClient.SqlProvider.System.Data.Linq.Provider.IProvider.Execute(Expression query) +162
   System.Data.Linq.DataQuery`1.System.Collections.Generic.IEnumerable<T>.GetEnumerator() +55
   System.Collections.Generic.List`1..ctor(IEnumerable`1 collection) +416
   System.Linq.Enumerable.ToList(IEnumerable`1 source) +69
   FlaktWoods.Falcon.Models.InstallationTypeItem.OnAvailability(Boolean& Handled, Dictionary`2 DataContext) in C:\DEV\FG\FALCON\FALCON_DEV\FlaktWoods.Falcon.Models\Configuration\InstallationTypeItem.cs:18
   FlaktWoods.Falcon.Service.FalconDataService.SetConfigurationItemAvailability(FalconSelectionInformation si, String Instance, String ClassConfiguration) in C:\DEV\FG\FALCON\FALCON_DEV\FlaktWoods.Falcon.Service\FalconDataService.cs:4456
   FlaktWoods.Falcon.WebUI.Controllers.DirectModeController.DirectMode(String category, String range) +7907
   lambda_method(Closure , ControllerBase , Object[] ) +191
   System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters) +35
   System.Web.Mvc.Async.<>c.<BeginInvokeSynchronousActionMethod>b__9_0(IAsyncResult asyncResult, ActionInvocation innerInvokeState) +39
   System.Web.Mvc.Async.WrappedAsyncResult`2.CallEndDelegate(IAsyncResult asyncResult) +70
   System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethod(IAsyncResult asyncResult) +42
   System.Web.Mvc.Async.AsyncInvocationWithFilters.<InvokeActionMethodFilterAsynchronouslyRecursive>b__11_0() +72
   System.Web.Mvc.Async.<>c__DisplayClass11_1.<InvokeActionMethodFilterAsynchronouslyRecursive>b__2() +387
   System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethodWithFilters(IAsyncResult asyncResult) +42
   System.Web.Mvc.Async.<>c__DisplayClass3_6.<BeginInvokeAction>b__3() +50
   System.Web.Mvc.Async.<>c__DisplayClass3_1.<BeginInvokeAction>b__5(IAsyncResult asyncResult) +188
   System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeAction(IAsyncResult asyncResult) +38
   System.Web.Mvc.<>c.<BeginExecuteCore>b__152_1(IAsyncResult asyncResult, ExecuteCoreState innerState) +26
   System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +68
   System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult) +52
   System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +39
   System.Web.Mvc.Controller.EndExecute(IAsyncResult asyncResult) +38
   System.Web.Mvc.<>c.<BeginProcessRequest>b__20_1(IAsyncResult asyncResult, ProcessRequestState innerState) +40
   System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +68
   System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) +38
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +648
   System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step) +213
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +131


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.7.4087.0