I am adding MVC & Telerik Kendo to legacy webforms application.
I have only just added MVC 5 itself to the project using an MVC area. (see http://www.davepaquette.com/archive/2013/12/30/so-you-inherited-an-asp-net-web-forms-application.aspx).
To add Telerik MVC, I am following the steps here: http://docs.telerik.com/kendo-ui/aspnet-mvc/asp-net-mvc-5
When I get to the step adding @(Html.Kendo().DatePicker().Name("datepicker")) to a "hello world" mvc, and try to access it, I get a "System.EntryPointNotFoundException".
Any ideas what could be wrong?
Additional info:
I made the web.config changes to (and only to) the web.config file in the MVC area.
The "~/Content/kendo/..." and "~/Scripts/kendo/..." are in their standard places, not in the MVC area. Not sure if this matters, but no errors appear to be generated by the telerik bundles in BundleConfig.vb.
Googling I have found mentions of <bindingredirects> in the web.config, but the Telerik instructions I am following to not mention this possibility.
10 Answers, 1 is accepted

Here is the stack trace:
[EntryPointNotFoundException: Entry point was not found.]
System.Web.Mvc.IViewDataContainer.get_ViewData() +0
Kendo.Mvc.UI.Fluent.WidgetFactory.DatePicker() +44
ASP._Page_Areas_MVC_Views_yowhatsup_Index_vbhtml.Execute() in D:\repos\Gone Gaia\MvcTest-Scott-BB\Trac\Trac.Application\Areas\MVC\Views\yowhatsup\Index.vbhtml:8
System.Web.WebPages.WebPageBase.ExecutePageHierarchy() +197
System.Web.Mvc.WebViewPage.ExecutePageHierarchy() +105
System.Web.WebPages.StartPage.RunPage() +17
System.Web.WebPages.StartPage.ExecutePageHierarchy() +64
System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage) +78
System.Web.Mvc.RazorView.RenderView(ViewContext viewContext, TextWriter writer, Object instance) +235
System.Web.Mvc.BuildManagerCompiledView.Render(ViewContext viewContext, TextWriter writer) +107
System.Web.Mvc.ViewResultBase.ExecuteResult(ControllerContext context) +291
System.Web.Mvc.ControllerActionInvoker.InvokeActionResult(ControllerContext controllerContext, ActionResult actionResult) +13
System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +56
System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +420
System.Web.Mvc.ControllerActionInvoker.InvokeActionResultWithFilters(ControllerContext controllerContext, IList`1 filters, ActionResult actionResult) +52
System.Web.Mvc.Async.<>c__DisplayClass2b.<BeginInvokeAction>b__1c() +173
System.Web.Mvc.Async.<>c__DisplayClass21.<BeginInvokeAction>b__1e(IAsyncResult asyncResult) +100
System.Web.Mvc.Async.WrappedAsyncResult`1.CallEndDelegate(IAsyncResult asyncResult) +10
System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +49
System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeAction(IAsyncResult asyncResult) +27
System.Web.Mvc.Controller.<BeginExecuteCore>b__1d(IAsyncResult asyncResult, ExecuteCoreState innerState) +13
System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +29
System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +49
System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult) +36
System.Web.Mvc.Controller.<BeginExecute>b__15(IAsyncResult asyncResult, Controller controller) +12
System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +22 System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +49
System.Web.Mvc.Controller.EndExecute(IAsyncResult asyncResult) +26
System.Web.Mvc.Controller.System.Web.Mvc.Async.IAsyncController.EndExecute(IAsyncResult asyncResult) +10
System.Web.Mvc.MvcHandler.<BeginProcessRequest>b__5(IAsyncResult asyncResult, ProcessRequestState innerState) +21
System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +29
System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +49
System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) +28
System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest(IAsyncResult result) +9
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +9711525
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +155

Further info:
I am using MVC 5.2.3 specifically.
I have already read this: http://www.finutia.com/blogutia/entry-point-was-not-found
I have tried adding this to the web.config:
<runtime>
<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
<dependentAssembly>
<assemblyIdentity name="System.Web.Helpers" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="System.Web.WebPages.Razor" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0"/>
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="System.Web.Mvc" publicKeyToken="31BF3856AD364E35" />
<bindingRedirect oldVersion="1.0.0.0-5.2.3.0" newVersion="5.2.3.0" />
</dependentAssembly>
</assemblyBinding>
</runtime>

For what it is worth, here is the complete web.config in the MVC area:
<?xml version="1.0"?>
<configuration>
<configSections>
<sectionGroup name="system.web.webPages.razor" type="System.Web.WebPages.Razor.Configuration.RazorWebSectionGroup, System.Web.WebPages.Razor, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35">
<section name="host" type="System.Web.WebPages.Razor.Configuration.HostSection, System.Web.WebPages.Razor, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" />
<section name="pages" type="System.Web.WebPages.Razor.Configuration.RazorPagesSection, System.Web.WebPages.Razor, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" />
</sectionGroup>
</configSections>
<system.web.webPages.razor>
<host factoryType="System.Web.Mvc.MvcWebRazorHostFactory, System.Web.Mvc, Version=5.2.3.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
<pages pageBaseType="System.Web.Mvc.WebViewPage">
<namespaces>
<add namespace="System.Web.Mvc" />
<add namespace="System.Web.Mvc.Ajax" />
<add namespace="System.Web.Mvc.Html" />
<add namespace="System.Web.Routing" />
<add namespace="System.Web.Optimization" />
<add namespace="Trac.Application" />
<add namespace="Kendo.Mvc.UI" />
</namespaces>
</pages>
</system.web.webPages.razor>
<appSettings>
<add key="webpages:Enabled" value="false" />
</appSettings>
<system.webServer>
<handlers>
<remove name="BlockViewHandler"/>
<add name="BlockViewHandler" path="*" verb="*" preCondition="integratedMode" type="System.Web.HttpNotFoundHandler" />
</handlers>
</system.webServer>
<runtime>
<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
<dependentAssembly>
<assemblyIdentity name="System.Web.Helpers" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="System.Web.WebPages.Razor" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0"/>
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="System.Web.Mvc" publicKeyToken="31BF3856AD364E35" />
<bindingRedirect oldVersion="1.0.0.0-5.2.3.0" newVersion="5.2.3.0" />
</dependentAssembly>
</assemblyBinding>
</runtime>
</configuration>

There seems to be a thread about the same problem, that has not gotten far:
http://www.telerik.com/forums/compile-kendo-mvc-against-mvc-5-2-3#LlxtAV1tmkespt3RBEPseA​

Also possibly useful is the version information provided with the error:
Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.6.81.0
Note that 4.0.30319 is the "runtime version" of my System.web.mvc, but it's "version" is 5.2.3. Version numbers always make so much sense, don't they? I am pretty sure it is the 5.2.3 that should be used in the bindingredirects, if such are even needed.
Hello Scott,
Would it be possible to share the project with us, so we can investigate the runnable sample and see what happens? We need this because from the provided information we are not able to determine what is causing the problem and suggest a possible solution.
Thanks for the cooperation.
Regards,
Kiril Nikolov
Telerik
Hello Scott,
I have a question that might be related to the problem - are you sure that the Kendo UI MVC assembly that you reference in your project is for the correct MVC version that you are using?
Regards,
Kiril Nikolov
Telerik

Hi,
Haven't been able to follow up on this for a while.
Where exactly would I check for the version mismatch? Thanks!

Here are I think there relevant version #s:
Kendo.Mvc: 2015.2.805.545
System.Web.Mvc: 5.2.3
and we also have (used by legacy code, unrelated to our efforts to convert to Mvc&Kendo in general):
Terlerik.Web.UI 2010.3.1215.40 <--- could this be creating a conflict of some kind?
We tried to reproduce the problem to no avail. Find attached our test project which uses Kendo.Mvc: 2015.2.805.545 and System.Web.Mvc: 5.2.3 and works as expected.
You can try removing Telerik.Web.UI temporarily to see if it makes a difference. The stacktrace of the exception should show its cause.
Regards,
Atanas Korchev
Telerik