Server Error in '/' Application.

Collection was modified; enumeration operation may not execute.

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.InvalidOperationException: Collection was modified; enumeration operation may not execute.

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:


[InvalidOperationException: Collection was modified; enumeration operation may not execute.]
   System.ThrowHelper.ThrowInvalidOperationException(ExceptionResource resource) +60
   System.Collections.Generic.Enumerator.MoveNextRare() +14533739
   System.Linq.WhereEnumerableIterator`1.MoveNext() +255
   System.Linq.Buffer`1..ctor(IEnumerable`1 source) +498
   System.Linq.<GetEnumerator>d__1.MoveNext() +118
   System.Linq.WhereSelectEnumerableIterator`2.MoveNext() +127
   System.Collections.Generic.List`1..ctor(IEnumerable`1 collection) +263
   System.Linq.Enumerable.ToList(IEnumerable`1 source) +43
   MCB.MasterPiece.Site.PageSystem.PageBlockFactory.GetPageBlockRelatedEntityGuids(PageBlockEntity blockEntity, ModuleEnum moduleEnum, Int32 subModuleGuid, Nullable`1 pageBlockTypeRelationGuid) +562
   MCB.Sites.Mobile.Core.Services.ProductTabbedDescriptionService.LoadItemGroupDescriptions(CommerceItemContainer commerceItemContainer, CommerceItemContainer masterCommerceItemContainer, PageBlockEntity blockEntity) in C:\teamcity\BuildAgent\work\f5a4e75b74205e4b\MCB.Sites.Mobile.Core\Services\ProductTabbedDescriptionService.cs:236
   MCB.Sites.Mobile.Core.Services.ProductTabbedDescriptionService.LoadDescriptionTabs(String tabKey, CommerceItemContainer commerceItemContainer, CommerceItemContainer masterCommerceItemContainer, PageBlockEntity blockEntity) in C:\teamcity\BuildAgent\work\f5a4e75b74205e4b\MCB.Sites.Mobile.Core\Services\ProductTabbedDescriptionService.cs:119
   MCB.Sites.Mobile.Core.Services.<>c__DisplayClass17_0.<GetDescriptionTabs>b__0(String tabKey) in C:\teamcity\BuildAgent\work\f5a4e75b74205e4b\MCB.Sites.Mobile.Core\Services\ProductTabbedDescriptionService.cs:96
   System.Linq.<SelectManyIterator>d__17`2.MoveNext() +265
   System.Linq.WhereEnumerableIterator`1.MoveNext() +255
   System.Collections.Generic.List`1..ctor(IEnumerable`1 collection) +526
   System.Linq.Enumerable.ToList(IEnumerable`1 source) +69
   MCB.Sites.Mobile.Core.Services.ProductTabbedDescriptionService.GetDescriptionTabs(CommerceItemContainer commerceItemContainer, Nullable`1 pageBlockEntityGuid, ExecutionContext executionContext) in C:\teamcity\BuildAgent\work\f5a4e75b74205e4b\MCB.Sites.Mobile.Core\Services\ProductTabbedDescriptionService.cs:95
   MCB.Sites.Mobile.Core.Blocks.Builders.Product.ProductTabbedDescriptionBuilder.BuildPageBlockModel(Object loadedEntity, PageBlockEntity blockEntity, Int32 blockTypeVersion, ExecutionContext executionContext) in C:\teamcity\BuildAgent\work\f5a4e75b74205e4b\MCB.Sites.Mobile.Core\Blocks\Builders\Product\ProductTabbedDescriptionBuilder.cs:38
   MCB.Sites.Mobile.Core.Factories.PageSystem.PageBlockModelFactory.Create(Object entity, PageBlockEntity blockEntity, ExecutionContext executionContext) in C:\teamcity\BuildAgent\work\f5a4e75b74205e4b\MCB.Sites.Mobile.Core\Factories\PageSystem\PageBlockModelFactory.cs:40
   MCB.Sites.Mobile.Core.Services.PageSystemService.GetNewPageRegions(Object entity, PageLayoutEntity pageLayoutEntity, IEnumerable`1 deviceHiddenRegionGuidList, ExecutionContext executionContext) in C:\teamcity\BuildAgent\work\f5a4e75b74205e4b\MCB.Sites.Mobile.Core\Services\PageSystemService.cs:1108
   MCB.Sites.Mobile.Core.Services.PageSystemService.GetPageViewModel(Object entity, PageLayoutEntity pageLayoutEntity, ExecutionContext executionContext) in C:\teamcity\BuildAgent\work\f5a4e75b74205e4b\MCB.Sites.Mobile.Core\Services\PageSystemService.cs:557
   MCB.Sites.Mobile.Core.Services.PageSystemService.BuildPageViewModel(CommerceItemContainer itemContainer, ExecutionContext executionContext) in C:\teamcity\BuildAgent\work\f5a4e75b74205e4b\MCB.Sites.Mobile.Core\Services\PageSystemService.PageLayoutLoader.cs:43
   MCB.Sites.Mobile.Core.Services.PageSystemService.BuildPageViewModel(T entity, ExecutionContext executionContext) in C:\teamcity\BuildAgent\work\f5a4e75b74205e4b\MCB.Sites.Mobile.Core\Services\PageSystemService.cs:236
   MCB.Sites.Mobile.Core.Controllers.ProductController.Show(Int32 id, List`1 options, Nullable`1 masterCartLineGuid, String zipcode, String ref_gr, Boolean isFromVariantTable, String productToken) in C:\teamcity\BuildAgent\work\f5a4e75b74205e4b\MCB.Sites.Mobile.Core\Controllers\ProductController.cs:320
   lambda_method(Closure , ControllerBase , Object[] ) +486
   System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters) +35
   System.Web.Mvc.<>c__DisplayClass24_0.<InvokeActionMethodWithFilters>b__0() +80
   System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation) +466
   System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation) +466
   System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName) +971
   System.Web.Mvc.<>c__DisplayClass152_0.<BeginExecuteCore>b__2() +42
   System.Web.Mvc.Async.<>c.<.cctor>b__15_0(IAsyncResult asyncResult, Action action) +24
   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) +43
   System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +73
   System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) +38
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +651
   System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step) +220
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +134


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.8.4700.0