Last Updated: 22 Jul 2020 12:25 by ADMIN
Created on: 16 Jul 2020 18:45
Category: UI for ASP.NET AJAX
Type: Bug Report
Telerik.Web.UI Version 2020.2.617

Hi Team,


I'm using Telerik.Web.UI Version 2020.2.617

I have integrated it and added a reference in my web application, asked me to upgrade the version of Assemblies "System.Web.Extension.dll" and "System.Core.dll" has to be upgraded to version 4.0, I did that too, Now I'm getting an error while I'm running or doing build "The type or namespace name 'Script' does not exist in the namespace 'System.Web' (are you missing an assembly reference?)", Assembly it is referring to "System.Web.Script.Services", same error is coming for other attributes like "ScriptMethod, ScriptMethodAttribute"

For the Key word "this" it is throwing as below error

It is throwing an error for "System.Linq.Expressions"




Can anyone help me out on this how to resolve these bugs.



P L P Kumar

1 comment
Posted on: 22 Jul 2020 12:25

Hi P L P,

The generic error you get is discussed in this StackOverflow forum -

Please try the ideas and let me know if you need any further assistance.

On a side note, the automatic and manual upgrade methods should not lead to the reported error - I am not sure how exactly you have integrated and referenced the Telerik.Web.UI.dll assembly, but it is important to know that if you are performing a manual upgrade and your project is configured to run on .NET 3.5, you have to obtain the Telerik assemblies from the Bin35 installation folder, if it is for .NET 4.0 from the Bin40, and if it is running on .NET 4.5 or later to get the assemblies from the Bin45 folders.

I also declined the bug report since it is a tech support question, but not a real bug in the Telerik AJAX controls.

Progress Telerik