Server Error in '/' Application.

Value cannot be null.
Parameter name: key

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: key

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: key]
   System.ThrowHelper.ThrowArgumentNullException(ExceptionArgument argument) +52
   System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add) +14338188
   System.Linq.Enumerable.ToDictionary(IEnumerable`1 source, Func`2 keySelector, Func`2 elementSelector, IEqualityComparer`1 comparer) +302
   VCMS.Kernel.EF.BasePageFront.GetRewritePage(String currentPath) in D:\Projects\VGroup\vcms\VCMS.Kernel\Web\BasePageFront.cs:180
   VCMS.Kernel.EF.BasePageFront.OnInit(EventArgs e) in D:\Projects\VGroup\vcms\VCMS.Kernel\Web\BasePageFront.cs:83
   System.Web.UI.Control.InitRecursive(Control namingContainer) +454
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1719


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.8.4494.0