Value cannot be null. Parameter name: key exception is thrown after Q2 2015 release

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  1. Telerik Admin
    Telerik Admin avatar
    1572 posts
    Member since:
    Oct 2004

    Posted 26 Jun 2015 Link to this post

    With the latest 2015.2.623 version of Telerik.Web.UI you could receive the following error:
    System.ArgumentNullException: Value cannot be null.
    Parameter name: key

    if you have grid with paging enabled and you run the page in Visual Studio Page Inspector. In order to workaround this issue you need to add the code snippet below in the web config file.

        <add key="PageInspector:ServerCodeMappingSupport" value="Disabled" />
    <compilation debug="true" targetFramework="4.0" >
            <remove assembly="Microsoft.VisualStudio.Web.PageInspector.Loader,
                   Version=, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />

    This problem is already fixed and the fix will be included in the next internal build and upcoming SP1.
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