Missing Intellisense/Unrecognized tag prefix

[dhuss]

I just updated my VS2012 to update 4 and my Telerik controls to v.2013.3.114.35. I also have JustCode v2013.3.1119.1 installed. Since then, my aspx intellisense no longer works for the telerik controls and I also get an "unrecognized tag prefix or device filter 'telerik'" message on each telerik control (tag.jpg). I have my telerik controls registered in my web.config file instead of on each aspx page (there are 300+ pages). I can see the controls in design view, the project compiles and runs okay. I do get intellisense for the asp controls (aspx) and for both asp and telerik in the code behind (vb). I have uninstalled the telerik controls and reinstalled, all to no avail. I have disabled/enabled JustCode. When I am inside a telerik control (aspx) and hit the space bar (intellisense should kick in here) all I get is a ( "db" Markup snippet for a data-bind attribute ) (snippet.jpg) in place of the intellisense.

Does anyone have any idea of how to fix this.

<pages>
     <controls>
         <add assembly="Telerik.Web.UI" namespace="Telerik.Charting" tagPrefix="telerik" />
         <add assembly="Telerik.Web.UI" namespace="Telerik.Web.UI" tagPrefix="telerik" />
         <add assembly="AjaxControlToolkit" namespace="AjaxControlToolkit" tagPrefix="ajax" />

[dhuss]

One thing I forgot to mention is this solution/project was created in vs2008 and upgraded to vs2012.

[Zdravko]

Hello Dennis,

This error is showed by VS and not by JustCode that is why nothing is improved when JustCode is disabled.
I made some research and found the following articles that could help:

1. Link1
   
2. Link2

Unfortunately, I was unable to reproduce the issue and test the solutions. 
Thanks.

Regards,
Zdravko
Telerik

[dhuss]

I found several posts across the internet with users having the same problem. One post showed changes that were made to the web.config file, so I made the following change to the web config file and all intellisense works. Not sure why it works but it does.

Old settings in the configuration/configsections

<sectionGroup name="system.web.extensions" type="System.Web.Configuration.SystemWebExtensionsSectionGroup, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35">
    <sectionGroup name="scripting" type="System.Web.Configuration.ScriptingSectionGroup, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35">
        <section name="scriptResourceHandler" type="System.Web.Configuration.ScriptingScriptResourceHandlerSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false"/>
        <sectionGroup name="webServices" type="System.Web.Configuration.ScriptingWebServicesSectionGroup, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35">
            <section name="jsonSerialization" type="System.Web.Configuration.ScriptingJsonSerializationSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="Everywhere"/>
            <section name="profileService" type="System.Web.Configuration.ScriptingProfileServiceSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false"/>
            <section name="authenticationService" type="System.Web.Configuration.ScriptingAuthenticationServiceSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false"/>
            <section name="roleService" type="System.Web.Configuration.ScriptingRoleServiceSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false"/>
        </sectionGroup>
    </sectionGroup>
</sectionGroup>

Changes:

<sectionGroup name="system.web.extensions" type="System.Web.Configuration.SystemWebExtensionsSectionGroup, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35">
    <sectionGroup name="scripting" type="System.Web.Configuration.ScriptingSectionGroup, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35">
    <section name="scriptResourceHandler" type="System.Web.Configuration.ScriptingScriptResourceHandlerSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication" />
    <sectionGroup name="webServices" type="System.Web.Configuration.ScriptingWebServicesSectionGroup, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35">
        <section name="jsonSerialization" type="System.Web.Configuration.ScriptingJsonSerializationSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="Everywhere" />
        <section name="profileService" type="System.Web.Configuration.ScriptingProfileServiceSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication" />
        <section name="authenticationService" type="System.Web.Configuration.ScriptingAuthenticationServiceSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication" />
        <section name="roleService" type="System.Web.Configuration.ScriptingRoleServiceSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication" />
    </sectionGroup>
    </sectionGroup>
</sectionGroup>