I am receiving this same error but I'm using the Infragistics.Web.Mvc.Free Version:3.13.1.2292.  Is there any upgrade to the free version to be compatible with MVC 5 dlls?

Attempt by security transparent method 'Infragistics.Web.Mvc.HtmlHelperExtensions.Infragistics(System.Web.Mvc.HtmlHelper`1<!!0>)' to access security critical type 'System.Web.Mvc.HtmlHelper`1<TModel>' failed.

Assembly 'Infragistics.Web.Mvc.Free, Version=3.13.1.2292, Culture=neutral, PublicKeyToken=7dd5c3163f2cd0cb' is marked with the AllowPartiallyTrustedCallersAttribute, and uses the level 2 security transparency model.  Level 2 transparency causes all methods in AllowPartiallyTrustedCallers assemblies to become security transparent by default, which may be the cause of this exception.

Many thanks Martin, this solved my problem.

Hello Mark,

You're using version of Infragistics.Web.Mvc.dll which is compiled against MVC 4. In the version 4.13.2.2055 the number 4 denotes the System.Web.Mvc.dll major version against which it is compiled.

In order to fix this you need Infragistics.Web.Mvc.dll is version 5.13.2.2055. You can find it in the following path (if you installed Infragistics products in the default location): C:\Program Files (x86)\Infragistics\2013.2\IgniteUI\MVC\MVC5\Bin.

Hope this helps,
Martin Pavlov
Infragistics, Inc. 

Good Morning Martin

I have just updated to 2013.2 and also updated all NuGet packages within my VS2012 project.

The solution compiles without a problem, but when running the application I get the following error in this code block:-

<script src="~/Infragistics/js/infragistics.loader.js"></script>
@(Html.Infragistics().Loader()
.ScriptPath(Url.Content("~/Infragistics/js/"))
.CssPath(Url.Content("~/Infragistics/css/"))
.Resources("igGrid")
.Render()
)

Attempt by security transparent method 'Infragistics.Web.Mvc.HtmlHelperExtensions.Infragistics(System.Web.Mvc.HtmlHelper`1<!!0>)' to access security critical type 'System.Web.Mvc.HtmlHelper`1<TModel>' failed.

My Infragistics.Web.Mvc.dll is version 4.13.2.2055 and my System.Web.Mvc.dll is version 5.1.20129.0

Please advise what I am doing wrong.