different version of AJAX

Dear All,

I and my friend are working on similar project.we installed the same VS 2005 version and SP1 and AJAX.my program has error.

it couldnt loadSystem.Web.Extensions does it cause by different version of AJAX?

or any other reason?

how can I fix this error?

<tagMapping>

<add tagType="System.Web.UI.WebControls.CompareValidator" mappedTagType="System.Web.UI.Compatibility.CompareValidator, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35">

<addtagType="System.Web.UI.WebControls.CustomValidator"mappedTagType="System.Web.UI.Compatibility.CustomValidator, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>

<addtagType="System.Web.UI.WebControls.RangeValidator"mappedTagType="System.Web.UI.Compatibility.RangeValidator, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>

<addtagType="System.Web.UI.WebControls.RegularExpressionValidator"mappedTagType="System.Web.UI.Compatibility.RegularExpressionValidator, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>

<addtagType="System.Web.UI.WebControls.RequiredFieldValidator"mappedTagType="System.Web.UI.Compatibility.RequiredFieldValidator, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>

<addtagType="System.Web.UI.WebControls.ValidationSummary"mappedTagType="System.Web.UI.Compatibility.ValidationSummary, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>

</tagMapping>

Have you tried to re-install the AJAX library again?

of course I tried to re-install AJAX but nothing happened

Sorry that I asked, but sometimes those are the common errors. Also are you sure that you installed 1.0 instead of 3.5?

As I saw in the version tab it is 1.0.does it cause trouble to install version 3.5 instead of 1.0?(if my problem is solved in this case)

hello.

well, the validators are not on the system.web.extensions assembly. I think that they're on the validators dll:

http://forums.asp.net/t/1066821.aspx

btw, if you update your app to use the new version, i think that you no longer need to use those validators.