[InvalidOperationException: Sequence contains no elements]
System.Data.Linq.SqlClient.QueryConverter.VisitInvocation(InvocationExpression invoke) +437
System.Data.Linq.SqlClient.QueryConverter.VisitInner(Expression node) +1226
System.Data.Linq.SqlClient.QueryConverter.Visit(Expression node) +18
System.Data.Linq.SqlClient.QueryConverter.VisitExpression(Expression exp) +18
System.Data.Linq.SqlClient.QueryConverter.VisitMethodCall(MethodCallExpression mc) +1072
System.Data.Linq.SqlClient.QueryConverter.VisitInner(Expression node) +975
System.Data.Linq.SqlClient.QueryConverter.Visit(Expression node) +18
System.Data.Linq.SqlClient.QueryConverter.VisitExpression(Expression exp) +18
System.Data.Linq.SqlClient.QueryConverter.VisitWhere(Expression sequence, LambdaExpression predicate) +128
System.Data.Linq.SqlClient.QueryConverter.VisitSequenceOperatorCall(MethodCallExpression mc) +3083
System.Data.Linq.SqlClient.QueryConverter.VisitMethodCall(MethodCallExpression mc) +76
System.Data.Linq.SqlClient.QueryConverter.VisitInner(Expression node) +975
System.Data.Linq.SqlClient.QueryConverter.Visit(Expression node) +18
System.Data.Linq.SqlClient.QueryConverter.VisitSelect(Expression sequence, LambdaExpression selector) +18
System.Data.Linq.SqlClient.QueryConverter.VisitSequenceOperatorCall(MethodCallExpression mc) +1010
System.Data.Linq.SqlClient.QueryConverter.VisitMethodCall(MethodCallExpression mc) +76
System.Data.Linq.SqlClient.QueryConverter.VisitInner(Expression node) +975
System.Data.Linq.SqlClient.QueryConverter.Visit(Expression node) +18
System.Data.Linq.SqlClient.QueryConverter.VisitFirst(Expression sequence, LambdaExpression lambda, Boolean isFirst) +21
System.Data.Linq.SqlClient.QueryConverter.VisitSequenceOperatorCall(MethodCallExpression mc) +3158
System.Data.Linq.SqlClient.QueryConverter.VisitMethodCall(MethodCallExpression mc) +76
System.Data.Linq.SqlClient.QueryConverter.VisitInner(Expression node) +975
System.Data.Linq.SqlClient.QueryConverter.ConvertOuter(Expression node) +82
System.Data.Linq.SqlClient.SqlProvider.BuildQuery(Expression query, SqlNodeAnnotations annotations) +117
System.Data.Linq.SqlClient.SqlProvider.System.Data.Linq.Provider.IProvider.Execute(Expression query) +137
System.Data.Linq.DataQuery`1.System.Linq.IQueryProvider.Execute(Expression expression) +28
System.Linq.Queryable.First(IQueryable`1 source) +216
Pegasus.Models.PricingModel.Retail(Int32 productID) in Y:\Pegasusold\www\Models\PricingModel.cs:36
Pegasus.Models.ProductModel.GetPrice(Int32 id) in Y:\Pegasusold\www\Models\ProductModel.cs:194
Pegasus.Models.Basket.AddItem(Int32 id, Int32 quantity) in Y:\Pegasusold\www\Models\Basket.cs:77
Pegasus.Models.CheckoutModel.AddItem(Int32 id, Int32 quantity) in Y:\Pegasusold\www\Models\CheckoutModel.cs:56
Pegasus.Controllers.CheckoutController.Add(String page, Int32 id) in Y:\Pegasusold\www\Controllers\CheckoutController.cs:50
lambda_method(ExecutionScope , ControllerBase , Object[] ) +126
System.Web.Mvc.ActionMethodDispatcher.Execute(ControllerBase controller, Object[] parameters) +17
System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters) +178
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters) +24
System.Web.Mvc.<>c__DisplayClassd.<InvokeActionMethodWithFilters>b__a() +53
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation) +258
System.Web.Mvc.<>c__DisplayClassf.<InvokeActionMethodWithFilters>b__c() +20
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodWithFilters(ControllerContext controllerContext, IList`1 filters, ActionDescriptor actionDescriptor, IDictionary`2 parameters) +193
System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName) +300
System.Web.Mvc.Controller.ExecuteCore() +104
System.Web.Mvc.ControllerBase.Execute(RequestContext requestContext) +36
System.Web.Mvc.ControllerBase.System.Web.Mvc.IController.Execute(RequestContext requestContext) +7
System.Web.Mvc.<>c__DisplayClass8.<BeginProcessRequest>b__4() +34
System.Web.Mvc.Async.<>c__DisplayClass1.<MakeVoidDelegate>b__0() +21
System.Web.Mvc.Async.<>c__DisplayClass8`1.<BeginSynchronous>b__7(IAsyncResult _) +12
System.Web.Mvc.Async.WrappedAsyncResult`1.End() +52
System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) +30
System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest(IAsyncResult result) +7
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +8677678
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +155
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