Sys is undefined

[David]

Hi,

We are having problems with an error that has started occurring the middle of development.
The errors we are getting are related to the "'Sys' is undefined" and "ASP.NET Ajax client-side framework failed to load."

This issue is don't occur in a constant bases. when browsing our website a user would hit a page then this error would occur. which locks up all the rad modules. the user can switch to other pages and the error would not show up until he switches back to the affect page. When the user removes the page name from the url (http://web/loc/Default.aspx => http://web/loc/)  the page load up correctly and it operational again. This issue don't seem to be affecting just one page but can happen on any page.

I will copy of or web.config file and paste it below.

Any idea why this would occur?

OS:Windows 2008 Server edition
IIS: version 7
Authentication: Windows Integrated (Domain Active Directory)
browser: Internet Explorer 8
telerik (UI/Skin) version: 2012.2.912.40 
language: C#

<system.web>
              <compilation debug="true" targetFramework="4.0"/>
              <pages>
                     <controls>
                           <add tagPrefix="telerik" namespace="Telerik.Web.UI" assembly="Telerik.Web.UI"/>
                     </controls>
              </pages>
              <httpHandlers>
                     <add path="ChartImage.axd" type="Telerik.Web.UI.ChartHttpHandler" verb="*" validate="false"/>
                     <add path="Telerik.Web.UI.SpellCheckHandler.axd" type="Telerik.Web.UI.SpellCheckHandler" verb="*" validate="false"/>
                     <add path="Telerik.Web.UI.DialogHandler.aspx" type="Telerik.Web.UI.DialogHandler" verb="*" validate="false"/>
                     <add path="Telerik.RadUploadProgressHandler.ashx" type="Telerik.Web.UI.RadUploadProgressHandler" verb="*" validate="false"/>
                     <add path="Telerik.Web.UI.WebResource.axd" type="Telerik.Web.UI.WebResource" verb="*" validate="false"/>
              </httpHandlers>
              <httpModules>
                     <add name="RadUploadModule" type="Telerik.Web.UI.RadUploadHttpModule"/>
              </httpModules>
       </system.web>
       <system.webServer>
              <validation validateIntegratedModeConfiguration="false"/>
              <modules runAllManagedModulesForAllRequests="true">
                     <remove name="RadUploadModule"/>
                     <add name="RadUploadModule" type="Telerik.Web.UI.RadUploadHttpModule" preCondition="integratedMode"/>
              </modules>
              <handlers>
                     <remove name="ChartImage_axd"/>
                     <add name="ChartImage_axd" path="ChartImage.axd" type="Telerik.Web.UI.ChartHttpHandler" verb="*" preCondition="integratedMode"/>
                     <remove name="Telerik_Web_UI_SpellCheckHandler_axd"/>
                     <add name="Telerik_Web_UI_SpellCheckHandler_axd" path="Telerik.Web.UI.SpellCheckHandler.axd" type="Telerik.Web.UI.SpellCheckHandler" verb="*" preCondition="integratedMode"/>
                     <remove name="Telerik_Web_UI_DialogHandler_aspx"/>
                     <add name="Telerik_Web_UI_DialogHandler_aspx" path="Telerik.Web.UI.DialogHandler.aspx" type="Telerik.Web.UI.DialogHandler" verb="*" preCondition="integratedMode"/>
                     <remove name="Telerik_RadUploadProgressHandler_ashx"/>
                     <add name="Telerik_RadUploadProgressHandler_ashx" path="Telerik.RadUploadProgressHandler.ashx" type="Telerik.Web.UI.RadUploadProgressHandler" verb="*" preCondition="integratedMode"/>
                     <remove name="Telerik_Web_UI_WebResource_axd"/>
                     <add name="Telerik_Web_UI_WebResource_axd" path="Telerik.Web.UI.WebResource.axd" type="Telerik.Web.UI.WebResource" verb="*" preCondition="integratedMode"/>
              </handlers>
       </system.webServer>

[Ianko]

Hello David,

From the provided information I am unable to investigate why the described problem is occurred.

It would be helpful if you could provide more information about:

• What controls are used in the project?
• What is their configuration?
• What are the exact steps leading to the problem?

Any additional information would be helpful for me to reproduce and investigate the problem locally.

Note that a simple, locally project, which isolates the problem would be useful for me, so that I could use the exact scenario in which the problem is reproducible.

Regards,
Ianko
Telerik